Equipping the barrel with the spiral grooves that spin-stabilize a bullet is the essential operation that defines an entire category of firearms. if you're talking about seating conicals, you need to be using shallow groove rifling. We have tons of experience with this style of rifling. I think one "con" is that the "5R" name is getting a bad rap due to recent marketing. buttoned rifling actually forge the grooves and they are smooth because the button if lubricated and. formation, shaping - the act of fabricating something in a particular shape. The barrel has a 5GR cut rifling with a 1-8" barrel twist. Cut rifling carves the rifling into the barrel a very small amount at a time, just like turning on a lathe is cutting the metal itself generally by no more than 50-150 thousandths of an inch at a time (depends on the lathe and tooling). Aug 27, 2011. 54 – 1/66. Both types of rifling can produce match winning barrels, however the market currently favors cut rifled. Now them making 20mm, 25, 30 and up to 105mm they can do and if I recall correctly they do a form of cut rifling but they just cannot do small caliber stuff. 6. Kr. It is more of a matter of finding the machines necessary to cut, as the zenith of cut rifling machine technology was in the late '40's early '50's. This method produces almost perfect concentricity between bore and. Rifling begins by mounting the barrel in the machine and setting the desired direction and rate of twist. Fryxell. The bullet you want to shoot will determine your required barrel twist rate. might be some minor differences in fouling or velocities but I think a quality job and lots of lapping is what really makes the difference. This comment assumes this rig is a cut rifling machine. The bullet was quite tight and twisted as it came out. Rifling can be achieved as either a metal cutting, or cold forming process. I personally think the whole cut rifled vs button rifled thing is over done and the merits of cut rifling and the downfalls of button rifling are often exaggerated. Then I cut a slot about 0. Traditional (Lands-and-Grooves) Rifling Standard rifling in pistols, which seems like an after-thought to most people, is called Lands-and-Grooves rifling. #10. This hook has to be pulled through the barrel’s bore on multiple passes before the process is complete. Their barrels are cut-rifled and. With their painstakingly meticulous manufacturing process, Krieger Barrels ensures every barrel is made with supreme accuracy and precision in mind. So, on a . Place the rifling cutter into the barrel of the gun and begin to make the cuts. Brux Barrels is a machine tool company located in Lodi, Wisconsin, specializing in the finest custom-made cut-rifled barrels. The lands and grooves are visible in reverse, spiraling the full length. For. We pay $125 more for a cut rifled blank so we charge $125 more for it. Rice uses a proprietary, infinitely-variable CNC rifling machine, which has a traditional Springfield type rifling head to single hook CUT each groove. . IMHO the real difficult part would be mastering how to. The cutting tool is attached to a cutter box, which. com. No need to worry about to hard to cut, or annealing after button rifling. Obermeyer got the idea for 5R rifling while examining the bore of a Russian AK-74 rifle in 5. Make sure to wipe down both the barrel and the tool with a clean rag to remove any residue. com. Sep 5, 2013. Dave, if you are going to be pulling your cutter by hand, I would stick with a high speed or cobalt tool, rather than carbide. The discs are produced by milling away parts of a larger diameter stock piece, leaving the discs standing upright on the support rod. Fairly sharp , (but not too sharp as to cut the patches) lands grip the best. 45 to . Rifling is the term given to the spiral grooves cut into the bore of a barrel which impart a stabilizing spin to the bullet. Conventional rifling has lands and grooves. I've also had a number of Rock Creek tubes on other rifles. They charge more for it because it takes substantially longer to produce due to the way the rifling is imparted to. the grooves to be cut are carved in relief on the button surface. These leave some burrs in the barrel after the grooves have been cut, so the barrel needs to be finished separately if these cutters are used. A sine-bar scrape- or hook-rifling setup is far more suited to one-offs. Adding rifling to a bore that is sized for smoothbore use will likely impart little spin to the projectile and cause a lot of fouling from gas flowing between the projectile and the bore. The cutter is shaped like a wide and squat "t" to fit into the slot with the center vertical of the "t" passing through the hole. With cut-rifling, the twist can be just about anything desired: Dan Pedersen’s rifling machine can make twists from straight to one turn in 6 inches. The problem is that the round bottom rifling cut by most barrel makers is to small in the radius cut. We also discuss. Cut-rifling allows for a wide range of possibilities. The curved surface of the cutter holder opposite the working edge bears against the side of the barrel for support and alignment. The Broughton 5c rifling looks alot like the rifling in a glock no sharp edges. 5” barrel is a match grade stainless steel barrel with a 1 in 15 twist. 1 x 0. The three major types of rifling are made by cut rifling, button rifling and cold hammer forging. #3. Whether it’s button rifling (100-400 Series), broach rifling, cold hammer forging, or single-point cut rifling (500 Series), there are plenty of valid options to choose from. The six groove deep rifling was designed to spin the soft lead shells that were generally being shot at the time. It's a production method for hundreds of barrels rather than being suited to a one-off. There are two main rifling types, standard and polygonal. well yes, the button head would need to possess shorter engraving protrusions so there would indeed be tooling. Each disc on the broach is a mirror. He recently purchased a Pratt & Whitney Sine Bar Cut-Rifling barrel machine. Although our machines are state-of-the-art, the process itself is the oldest and slowest method of rifling a barrel. It is best for barrels that do not require deep rifling grooves. The results of rifling gives a barrel its _____ Class characteristics . Remove the cutter and using the knife, slightly deepen the lines. A newer method of rifling barrels, called Electrochemical Rifling, does not involve the normal machining processes of the other techniques. It is sometimes called "hook rifling" after the fishhook-shaped cutter used. The cutter rests in the cutter box, a hardened steel cylinder made so it will just fit the reamed barrel blank and which also contains the. The 2 main choices for base are from Marlin and Winchester. Today, four- and six-groove barrels are the most popular. This was done either with a rod with a hard piece of steel. 60. 0)Actually, making the rifling in a gun barrel can be done in a few ways. Sizes range from 14 caliber Rifles to 10 gauge rifled shotgun barrels and can be ground with any helical twist right or left handed. The ANSWER on . [Jeff Rodriguez] has been busy testing a feasible DIY method for rifling a barrel and has found some success using salt water, a power supply, wire, and 3D printed parts to create. The cutter rests in the cutter box, which is a hardened steel cylinder made so it will just fit the reamed barrel blank, and which also contains the cutter raising. During the search for rifling cutters I have found a lot information about rifling machines ( old and modern ). The broach is fed down the barrel with a rotation that matches the twisting ground in the tool, with each progressive tooth increasing the depth of the cut. We build 90% of our rifles with Bartlein 5R tubes. To get started with a complete gun barrel manufacturing system, contact Ed Kays at (660) 886-9929 or [email protected] required multiple iterative passes of a cutting head for each groove (at first this was done with a "scrape cutter", and later a "hook cutter"). provide exceptional accuracy. The 80G was made in 1965 only under the Glenfield name and was the same as the 80C except for having a. to the ratchet rifling shown above, you would have to "re-cut" the tops of the lands, I don't know of any barrel maker. The first thing I did when I took the rifle out of the box was to weigh it and it was just barely over six pounds. The quality of the barrels turned out. The rifling cutter should cut the groove into the barrel of the gun at a slow, steady pace. The cut rifling machine is old but functions flawlessly. Cut rifling is a single point rifling system in which the cutter is pulled through the barrel and rotated at. Cut rifling . I cut the shoe recess, 1-3/8 inch long about 1/2 way through the rod. The hammer forged barrel cost a lot more for up front investment in machinery to do the process. For large caliber solutions we use UNISIG B-Series deep hole drilling machines for drilling and bore finishing and a R100 or R200 CNC rifling machine. Correct me if I'm wrong, but what made 5R famous was its enhancement over other geometries of cut-rifling . This is on a CBA Heavy category rifle and using cast bullets of course. GMX bullets shows rifling lands road over the top of the. 1 deep. 6 x 0. We use a HAAS T-L 2 Lathe for the ent. Parallel spiral grooves cut or impressed into the bore of rifles and pistols in order to make them spin, insuring a steady, point on flight to the target. Button barrels the twist is mostly controlled by the shape of the button and the twist rate can vary depending on many variables. Button or cut rifling leaves a linear pattern. Hook and scrape rifling are no longer used by manufacturers that mass produce barrels; however, some custom barrel makers may still use these methods. The others were unnamed gunsmiths in Augsburg, Germany in 1498. As we noted in the previous post, Cut Rifling produces very accurate results, but it is very slow to manufacture as the rifling is cut little by little. Rifling twist is consistent from one end to the other. A broach can be used to cut rifling into the inner surface of a barrel, b. The cutter is adjusted to cut one- to two-thousandths of an inch of metal on each pass. This gives the polygonal barrels a tighter gas seal on the projectile. 1 x 0. Invented in N uremberg around 1520, the cut-rifling technique creates spiral grooves in the barrel by removing steel using some form of cutter. Rifling refers to the spiral grooves that are cut into the internal surface, known as the bore, of a gun barrel. Drill and reamer marks are not removed by button rifling as they are with cut. The originals I have examined favor 7 L/G and very narrow deep. The twist is exact, where as other forms of rifling can have variances due to the process they use. Cut-Rifling is unique from other rifling methods in that it allows virtually any twist rate to be cut into your barrel. The article explains four common methods of rifling the interior of barrels: Cut Rifling, Broach Rifling, Button Rifling, and Hammer Forging. It is best for barrels that do not require deep rifling grooves. Electron discharge machining (EDM)The following types of rifling use similar processes as the ones aforementioned. 004 deep per side per groove. 35s, to ensure stabilization of even the longest bullets. 62 – 1/66 – 1/72. Although our machines are state-of-the-art, the process itself is the oldest and slowest method of rifling a barrel. Cutting metal from the bore produces rifling with fewer lands and grooves than pushing a tungsten carbide die through the bore which produces “button rifling. Also when a rifling head is used in scrape or hooked rifling the groove depth will be shallow when the head is introduced into the bore and again when it is removed at the muzzle end. It actually cold forms the rifling into the reamed bore of the rifle. There is even a sequence showing chambers being cut. LBC uses precision cut rifling when making their barrels and the barrels on these match rifles have a 1:10″ twist with five lands and grooves. Button rifled barrels are usually cheaper than cut rifled mainly due to reduced time in manufacture. In a cut barrel the twist rate is conrolled by turning the cutter as it passes down the barrel. After the rifling has been cut, clean the barrel of the gun and the rifling cutter carefully. . Rifling in a . “But the process is slow. The elliptical gears were to speed up the return of the cutter [the rifling rod passed thru the barrel with a scrape cutter and a tapered "needle" to raise same]. 1 deep. The Castle 110 is fitted with a router that cuts the. Don. In addition, the article describes a new (and somewhat radical) method, Cation Rifling, which employs acid to. Rifling twist rate can be changed. Marlin started using Microgroove rifling in the early 50's and before that they used Ballard rifling. Grab a cleaning rod, jag and patch. As the barrel is cold hammer-forged, a giant machine literally pounds the barrel from all sides around an internal carbide mandrel, which forms the rifling inside the bore. There are 5 different rifling methods, cut, button, broach, cold hammer forged and ECM. 1. The button was also turned by a spiral guide,and was pushed and. 58. The part that grips the patch is the edge of the rifling. Cut Rifling Cut rifling is the oldest method of rifling a gun barrel. The . Each cut, or groove, is separated by a ridge of metal called the land. A rifled barrel is slightly undersized so that the rifling will cut into the projectile. Screw the two parts together and start sharpening the cutter. Standard in swamp barrels. Origin action hawk hill 6. Chambering the Shilen I could tell by the chips on the reamer it was a softer blank. "Button rifling is an efficient and easier process than cut rifling to get a quality barrel," he said. An original Winchester 1885 High Wall came with a 40- 82 WCF and a severely deteriorated barrel. It will only cut the rifling leade. We proudly create rifle barrels for F-Class competitors,. The first was Vienna gunmaker Gaspard Kollner. This article describes in detail how barrels are crafted, using both cut-rifling and button-rifling methods. Choose Options. You may need to adjust the speed of the cutter as you make the cuts. Double scrap cutter tooling was being used/made back even when the cut rifling was done manually by a human pulling the cutter thru the barrel by hand! Places have converted/modified the Pratt’s for pulling broaches and even pulling buttons. 104. Current is applied and the “wet etching” process eats away metal in the desired areas to produced. As I understand the Microgroove was cheaper and easier to manufacture, plus it made the rifles more accurate. Hero Member;. In its traditional form, cut rifling may be described as a single-point cutting system using a “hook” cutter. Lands and grooves having a rounded profile. They charge more for it because it takes substantially longer to produce. As previously stated it is hard to get extra deep rifling to seal, and not burn up the patch. Conventional rifling, while effective, can be improved upon in two ways. 004" deep giving a total depth side to side (Groove diameter) of . One of the main purposes of Microgroove rifling was to help the bullet seal off the bore better to keep the expanding gas behind the bullet, and. Tooling – gundrills, reamers, rifle buttons. Historically, low-budget small-run, small-shop and independent prototype rifling has usually been done with a single-point scrape cutter, as it is the most readily improvised tool. Button-swaged rifling. Cut rifling is the oldest method that is still being used. It is chambered in 30 BR and it is accurate. Back in the day it was all about very deep cut rifling. 22 caliber barrels or pellet guns. Cylinder stop - A device to stop cylinder rotation in proper alignment with the barrel of a revolver. 4' stick of 4" SCH-40 PVC with a strip of something wrapped around it like a barber pole. In traditional rifling, ‘tools’ such as buttons or broaching bits are used to either press or cut grooves in the bore giving the barrel a defined rate of twist. Following that you can see barrels being contoured, polished, and inspected (with air gauge and bore-scope). At a practical level there is no difference as to the "extreme high quality, accuracy, and durability (lifespan)" of barrels made by CHF versus button rifled for AR15 type barrels. by Glen E. Polygonal rifling . It was a success. The answer was the broach. Mar 24, 2011. The grooves cut around the shank of many of today’s bullets solve the problems associated. Hold the equipment square, parallel, and concentric everywhere, because precision is the byword in barrel making work. This type of rifling is produced with Hammer Forging . 22 caliber barrels or pellet guns. Rifling. Cut rifling - Cut rifling creates spiral grooves in the barrel by removing steel using some form of cutter. Avoid the temptation to make your hook too agressive. Instead of being smaller than the radius of the bore, the radius of the cutter should be at least twice as large as the bore radius. SPECS: 22 call land/groove diameter: . One was hammer forged and I haven't seen a smoother bore on a rifle out of the box. This required multiple iterative passes of a cutting head for each groove (at first this was done with a "scrape cutter", and later a "hook cutter"). With cut rifling, grooves are carved into the barrel using a cutting tool, whereas with button rifling, grooves are pressed into the metal using a hardened steel button. The article explains four common methods of rifling the interior of barrels: Cut Rifling, Broach Rifling, Button Rifling, and Hammer Forging. [1] It causes the bullet or projectile to spin as it flies through the air. Broach cut rifling cuts all the grooves at the same time as the broach is pulled through the barrel. Button-swaged rifling. It was a tedious and expensive process in which each groove was cut by hand. 5R is an improvement over conventional rifling by changing the shape and configuration of the lands and grooves. Sep 5, 2013. This widly held belief was one of thep principal reasons Marlin switched to the Ballard style. Broached rifling. The first barrel was converted to a 35 caliber barrel, and then a variety of other calibers were. Button rifling is done with a straight barrel blank to reduce the amount of variation in the groove diameter. It would be a lot more durable. As the name implies, the 5-R rifling on the 20-inch stainless steel, hammer-forged barrel is one of the rifle’s major features. Square bottom CUT rifling to . Also no barrel maker can measure for residual stress in the material. The cutter removes approximately . On my 3 groove barrel you can clearly see the leading edges of the lands being eaten away at. The traditional method is called single-point cut rifling. There has to be a reason everyone does it and its not just cost alone. If I was forced to pick a winner it would be the Remington. Drill and reamer marks are not removed by button rifling as they are with cut. The GROOVES are a bigger diameter than The Caliber or Bore. It’s also standard in test barrels Krieger supplies to the ammunition industry manufacturers. Button rifling causes the metal in the bore to displace around the die and is. This is why . See Figure 103 & 104. Cut rifling is no longer considered economical in mass prod. The rifling process is a key part of barrel manufacturing, resulting in lands (bore) and grooves that create a spiral down the length of the barrel. doing this. pulled button also continues. Click Arrow to Watch Krieger Barrels Video:Rifling broach. Rifling tool having one or two raised cutting edges that cut the grooves of rifling. On the other hand, many shooters believe cut-rifled barrels last a bit longer. stefan73 Sergeant. Rifling can be. Single-point rifling. The TAC 501 rifle system is a heavy 416 SS barrel with cut rifling, manually operated, detachable box magazine with five +1 shot capacity. The question that first comes to mind is why you have an issue with 5r rifling. . Most of the weapons the firearms examiner will encounter have been rifled by one of these two methods, and mostly by the second. The reason Ruger went with 18-3/4 inch twist on the Double-Action revolvers is because this is the pitch on the rifling broach cutters and there is only one company that makes them. As a result, it is most commonly seen in . Single point cuts the rifling one groove at a time. 58 caliber, 3 Land & Groove, 1 in 72" Twist barrels, and most importantly, just like the originals, the machine cut "Progressive Depth Rifling-just like that found in original Springfield rifle-musket barrels. This makes it expensive. Grooves: Round bottom CUT rifling . are experiencing increasing demand. 308-inch bullets instead of . During the rifling process the cutter only removes . 1675 posts · Joined 2007. Bear Creek Arsenal. The rifling button is pulled a. The rod should spin freely in its handle, and the jag and patch should fit snugly in your barrel. 30 cal, say 1 in 10, 11 or 12" (if you offer one of each), you’ll need a mandrel appropriate to each. 5R – A 5-groove rifling pattern that is sloped or angled side to the “lands. When running properly a carbide cutter is capable of rifling 10-20 barrels before resharpening. None of which can be done on a standard lathe. Inner surface of barrel of a gun leaves its class characteristic markings on a bullet passing through it; these markings are peculiar to each type. Broached rifling. Button rifling which is much faster is the result of pulling or pushing a button with projections on. #1. The 18-3/4 twist gives better accuracy with the lighter +P jacketed loads, 110-125 grain bullets, which most people shoot. The cutter rests in the cutter box, a hardened steel cylinder made so it will just fit. The path of the projectile in flight. 308" in our example, and the rifling cut away with little or no discernable line connecting the ends of the rifling, meaning the throat is matched to the bullet diameter, . if you're talking about seating conicals, you need to be using shallow groove rifling. The ideal is to have the correct groove diameter, . Scrape Cutter. I am looking to build up a lever . The six groove deep rifling was designed to spin the soft lead shells that were generally being shot at the time. In its traditional form, cut rifling may be described as a single point broaching system using a "hook" cutter. Images of Cut-Rifling process courtesy Accurate Shooter Rifling is usually expressed as a twist rate; that is the length required to complete a full revolution along the horizontal access. The cutter body features a TiCN coating for long-lasting accuracy of results. Cut rifling is done by hand or with a tool that cuts one groove at a time through the barrel. Button rifling can be done a couple of different ways but basically it is a cold swagging process. It causes the bullet or projectile to spin as it flies through the air. What im saying is from what Ive seen from two different barrels with diferent styles of rifling. Brophy's book on Marlins. Krieger Barrels offers a wide variety of twist rates that are appropriate for popular bullet weights in any given caliber but it is also possible to specify your own custom twist rate. rifling occurs when the groves and lands are put into the barrel - this allows for the bullet to have a spin on it so it flies better 1 manufacturer chooses a rifling process, the class characteristics of the weapon’s barrel will remain consistent, each will have the same # of lands and grooves, w/ the same approximate width and direction of. Cylinder - The rotatable part of a revolver that contains the chambers. 0001-inch per pass. You will find button and cut rifling in those arena's. Bartlein Barrels. Rifling in a . ”. 3. Didn't copper foul at all. Marlin's Microgroove Barrels. How does button rifling compare to cut rifling? Button rifling is generally considered more cost-effective than cut rifling as it requires less time and labor. Conventional lands and grooves are replaced by “hills and valleys”. Lawton did cut rifling, and also produced the worst barrel regardless of rifling method my gunsmith ever had in his shop with 33 years gunsmithing experience. “Rifling with a single-point cutter is slow and costly but imposes little stress on the blank,” John Krieger explained. Please allow 3-5 business days from order placement to shipment to allow us time to contour. Fryxell. I don’t have a more accurate date for Kollner. By the nature of the manufacturing process, cut-rifling puts fewer stresses in the steel and twist rate is more likely to be uniform. #10. 004″ per size of material to insure a precision clean bore which sets up the style of rifling tool to. Now, many years later, I find that rifling that is too deep can be more of a hinderance, than a help. Ivan says he achieved 3-inch groups at 25 yards, using his test fixture and commercial ammunition. Now we will study a more modern technique called Broach Rifling. Senior Member . and you will find a bunch of stuff but to briefly recap:Helical grooves known as rifling are cut into the bore of a barrel of a firearm during production to increase the accuracy of that firearm. Broaching uses multiple cutting surfaces (cutters) mounted on the same axis to progressively remove metal. This has been the old standby in terms of rifling because it nearly never. 254 posts · Joined 2023. This change in cutter geometry, along with several changes made to the machines themselves, have made the act of cut. 58 and . A bullet traveling down a 12-inch barrel with a 1:14” rate of twist will still be spun at the 1:14” rate. The first step in making a barrel is to cut the bar to a length of 28″ or so, for a barrel that will finish to a normal length. A broach is merely a long tool with multiple cutting elements on it. Using a small 1/8" chisel, carefully remove the wood from the inside the mortise to a depth of about 1/32" to 1/16". I cut a few grooves and the cutter slid in and out of the bore like riding. Couple 2x4s, some screws, a small stick of round bar, some clamps, and a cutter head that I'll machine. 13). With specialized cells dedicated to this industry, we have. (see my homepage) Also see page 204 in the 1968 Gun Digest. In order to produce rifling similar. #3 · Feb 17, 2004. It should be fluffy and feel like very fine tissue paper when crushed between your fingers. Single-point rifling. are experiencing increasing demand. While button or cut rifling must start with a hole somewhat smaller than finished size, hammer forged blanks have holes about 20% larger than finished size. Single point cut rifling is the most accurate method of rifling and produces low stress on the barrel during the cutting process. Rifling refers to the spiral (helical) grooves that are cut or swagged on the internal surface (bore) of a gun barrel, which helps impart the spinning motion to a bullet when it’s fired. The big bore . The cut-rifling method removes metal from the surface of the bore to create the grooves using a single-bladed, hook-type cutter of groove width that is pulled through the cold barrel. Just making the buttons took a fancy cutter grinder and diamond wheels as well as a premium grade of carbide. Button rifling and the draw bench methods are shown. engineering. If the chip is not the full width of the groove, it means there is a nick in the cutting edge, or your cut is not deep enough. The work hardening of the barrel steel caused by the button results in a bore surface that is denser than a cut surface. Brux Barrels is a machine tool company located in Lodi, Wisconsin, specializing in the finest custom-made cut-rifled barrels. My dad made both button and scrape cutter rifling machines to rifle his ML barrels up to 60 cal and 2in dia. 0001" per pass. Must say I prefer cut rifling. Cutting is similar to broaching. It takes far longer to cut-rifle than to button- or broach-rifle a barrel. Cut rifled tubes can be made a few Rc points harder which should help in longevity. 6K fps. A honing machine is similar except for not needing the high pressure lube + very specialized hones. A button does not cut. With this type of cutter, it is possible to set the depth of cut very precisely by rotating the bolt on the left side. The four basic methods of making rifling in a barrel are single-point, broach, button, and hammer-forged. Hammer forging has a distinct advantage here. The upper is a place in the chamber where the shoulder is . You can see this in the image above . I used a Weaver brand picatinny scope base for a. 224. They varied a lot!Krieger Barrels has been making premium rifle barrels for over 30 years. The lands and grooves create a unique pattern on the bullet casing that can be used to identify the gun from which the bullet was fired. The most common cut rifling method used in. 400″. With a gain twist barrel the bullet cannot go to sleep. The curved surface of the. That is partly why cut rifling these days is the preferred technology of high-end barrel makers. To get started with a complete gun barrel manufacturing system, contact Ed Kays at (660) 886-9929 or ekays@kays-dehoff. Our barrels are gundrilled with counter rotating gundrilling system. The cut-rifling method. March 8, 2017. Electrolysis Rifling. Button rifled barrels are usually softer hardness wise to push / pull the button thru the bore. This is because the cutter is not supported on both sides of the cutter box. Maybe . S&W advertises that the smoother surface produced by EDM is an improvement over the broach cut rifling it replaced approxamently 1997 for most centerfire production revolvers. Read more about our single-point cut-rifling here. Generally, blades that cost $50 or more are worth sharpening while it is better to replace cheaper,. Rifling cutter US2757580A (en) 1952-11-07: 1956-08-07. 5R is a 5-groove rifling pattern with sloped or angled sides to the lands.