The 6mm bore diameter has long been relied upon for double duty, serving the deer hunter and varmint/predator hunter equally well.  The acetone doesn’t evaporate as fast as the TCE. What are the 6mm Cartridges: 6mm Lee Navy; 6mm Creedmoor 100- to 115-grain bullets, which the .243 case has trouble fitting in a short-action magazine. Messages: 12,385 Likes Received: 5,072. That said, I feel it will be some time until the .243 Winchester is unseated, especially among hunters.  The reamer is stopped and cleaned often.  This vise, from Brownells, uses a set of aluminum or steel bushings matched to the outside diameter of the barrel. The 6.5mm bore diameter was an obvious choice, but the .260 Remington case was too long to allow the use of the high B.C. Bill Marr Remington 700 SPS Varmint chambered in 243 Winchester.  Since this rifle had good bones, we decided to rechamber it in another cartridge, 6 Creedmoor.  This is important to prevent the barrel from slipping when it is help in the barrel vise. Take a look at any good ballistics program—Hornady and Federal both have an easy-to-use program on their websites—and you’ll see the advantage of the better B.C. I like to sneak up on final headspace. Maybe it isn’t you…, Indoor Optical Training Aid (I.O.T.A.)  Grayboe is a new company, started by Ryan McMillan.  The part are placed in a heat curing oven and allow to heat, this will allow any oil in the metal to leech out. However, having been with us since 1955, the .243 Winchester is a very effective hunting cartridge, especially inside of 500 yards, and when used on game animals of suitable size and build. The target crowd—especially those who are competing in or have an interest in the PRS competitions—will certainly appreciate the down range benefits of those high B.C. There have been military developments, as in the 6mm Lee Navy (father of the .220 Swift), but the post-WWII era saw some very fine designs; 1955 alone saw three important 6mm cartridges. The 6mm ARC is a brand new cartridge that Hornady designed to fit into a standard AR-15. Mag.• .243 Winchester vs. 6mm Remington• 7x57mm Mauser vs. 7mm-08 Remington• .25-06 Remington vs. .257 Weatherby Magnum• .338 Winchester vs. .375 H&H Magnum• .30-30 Winchester vs. .35 Remington• .257 Roberts vs. .250-3000 Savage• .270 Winchester vs. .280 Remington• .35 Whelen vs. 9.3x62mm Mauser• .416 Rigby vs. .416 Remington Magnum• .308 Winchester vs. .30-06 Springfield• .22 Nosler vs. .224 Valkyrie• .300 Win. A 35 degreee high-speed steel profile tool is used to cut a small stop groove between the threads and the part of the tenon the lug will sit on.  Removing factory barrels can be difficult, use of a port entry action wrench can bend the action, a wrap around wrench, like the Brownells shown in the picture above, is a better choice for this type of operation. The reamer is coated in Do-Drill cutting oil and inserted into the chamber.  While I’ve built two different 6mm BRs on 700s that extracted well, I elected to avoid potentially dealing with this issue and pick a cartridge with a longer case length. I’m not sure if the ability to load the longer bullets with higher ballistic coefficients, in a 308 length magazines, can be offset by the decreased chamber volume. The smaller firing pin hole is not the only design change of JP's HP bolt. Another view of the factory barrel tenon, this one with the factory recoil lug in place. The 6.5 Creedmoor came onto the scene just about a decade later as a result of the work of Dave Emary of Hornady and Dennis DeMille of Creedmoor Sports, who paired to come up with a long-range target cartridge. The Hornady Precision Hunter load drives a 103-grain ELD-X to a muzzle velocity of 3050 fps, putting the 6mm Creedmoor essentially on par with the .243 Winchester, but it’s the ability to properly seat the longer bullets with the best ballistic coefficients that gives the 6mm Creedmoor the edge out beyond 500 yards. While the latter two designs are viable hunting cartridges, neither of them really challenged the .243 Winchester’s position at the top. Stock Number: RL 550 Caliber.  The vise is attached to the leg of my work bench. All of these cartridges, along with the .243 Win., share the .308's .473 rim diameter and .470 head diameter. As I understand it the 6.5 Creedmoor is on a case very similar to the 308 and can be made from 308 case's.  Everything looks good. After a long soak the parts are allowed to dry. I mount the barrel in the lathe between centers. My buddy John Snow—now editor of Outdoor Life—was writing an article about the pleasures and pitfalls of developing his own cartridge. .243 To 6mm Creedmoor Discussion in 'General Firearms Forum' started by ede, Jan 28, 2017. Mag. The popularity of 6mm cartridges has waxed and waned over the decades, but appears to be peaking again. Snow has found this extends brass life, as well as giving more room in the shortened case. 6mm Norma BR 243 Winchester 250 Savage 260 Remington 6.5/284 Norma 7/08 Remington 284 Winchester 300 Savage 308 Winchester 338 Federal 35 Remington 358 Winchester 6 & 6.5 Creedmoor 6.5 Lapua 6XC Short actions with a bolt face .Dia of .540+/-223 WSSM 243 WSSM 25 WSSM 7mm Remington saum 7mm WSM 300 Remington saum, 300 WSM 325 WSM 350 Remington … The Hornady Precision Hunter load drives a 103-grain ELD-X to a muzzle velocity of 3050 fps, putting the 6mm Creedmoor essentially on par with the .243 Winchester, but it’s the ability to properly seat the longer bullets with the best ballistic coefficients that gives the 6mm Creedmoor the edge out beyond 500 yards. Review: Dry practice with a scoped rifle, In this post we will take a look at a budget shotgun rebuild/conversion.  The parts are sent back to the oven and allowed to cure. From that marker, the 6.5 Creedmoor overtakes the .243 Win and carries higher velocities than the .243 that bleeds off velocity at a much higher rate. It is a nearly dead cartridge though so components are harder to come by.  The parts are placed in a fiberglass bin. Get the American Hunter Insider newsletter for at-a-glance access to industry news, gear, gun reviews, videos and more—delivered directly to your Inbox. The action can now be test fit on the barrel. Our stainless steel teflon coated in black conversion kits include a new Pro Series Floor metal and magazine box. Thread Tools.  Note I use a different wrench (Surgeon) and vise to install the barrel than I used to remove it. As a caliber, the 6mm has the least number of commercial members. Like its father, the .243 Winchester is an efficient cartridge, and will give good velocities without being too hard on barrels.  Perhaps the biggest difference between the two is the brass, the Lapua can be formed from Lapua brass, while the Creedmoor requires either the use of Hornady brass (which isn’t very good) or Norma brass which isn’t always encountered. Length refers to the cartridge case length; OAL refers to the overall length of the cartridge; Measurements are in millimeters then inches, i.e. (originally the .244 Rem.  I knew I wanted something that burned less powder than the 243 Winchester, and came up with a few different options, the 6mm BR, 6 Dasher, 6×47 Lapua, and 6 Creedmoor.  I decided to reuse the lug on this rifle since it was flat when I checked it.  This one is equipped with a reamer stop to help control the depth of cut. A 3/8″ high-speed steel insert boring bar is mounted in the lathe to cut a new bolt nose recess in the rear of the barrel. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. Cerakote heat cure, MAGPUL flat dark earth, 6.5 Creedmoor load development: 16.5 inch barrel, 123 SMK and 140 SMK, Installing a pre-fit barrel on a Remington 700, Refreshing a poorly machined Remington 700 action, 1911 Gunsmithing: lower and flare ejection port, Sheared screw removal (drill and back out method), 308 Winchester Barrel Length and Velocity: Federal 168 grain Gold Medal BTHP, 60 years too early? I know 22-250 cases are preferred for forming 6.5 Creedmoor, but I would think 243 brass would work. I mount the barrel in the lathe between centers. Let me know what you think!  Have a certified gunsmith inspect and check any work prior to attempting to fire.  I hang them on a rack so I can blow off any residual media from the cabinet. It uses the same design method as the 6.5 Creedmoor; this results in excellent and consistent accuracy from one gun to another and load to load. Now the decision was between 6×47 Lapua and 6 Creedmoor. First, virtually all bolt-action hunting rifles are available in .243, and there are also AR-10 variants as well (though they won't handle really long, high BC bullets if that matters to you.)  Since the original chamber is for 243 Win, a larger cartridge than the 6 Creedmoor, I begin by cutting off the threaded end of the barrel. RL 550 Caliber Conversion Kit. Drop and wind deflection are considerably less with the bullets loaded in the 6mm Creedmoor, and therein lies the difference.   A piloted form tool will not work in this application since the barrel already had previously been chambered. For example, one of the flattest-shooting, most accurate cartridges in the .243 / .308 Winchester family is the exciting new 6.5 Creedmoor. Check out JP's site if you want the list of things you get with their HP bolt. Let’s customize this 700 SPS! All content Copyright 1998-2018 Rifleshooter.com, FTC disclosure: some links on this site are monetized. Commonly encountered match cartridges, left to right: 6mm BR, 243 Winchester, 6×47 Lapua, 6 Creedmoor, 6.5×47 Lapua, 6.5 Creedmoor, 260 Remington, and 308 Winchester Selecting test loads. (Prices as of 8/2016).  This allows for smooth feeding. There is no secret, I’ve never been a .243 Winchester fan, always preferring the much hotter 6mm Remington. Enter your email address to subscribe and receive notifications of new posts by email.  Decisions, decisions… I already have a 6×47 Lapua that hammers, so 6 Creedmoor it is! Sorry, your blog cannot share posts by email. Any modifications made to a firearm should be made by a licensed gunsmith. or on the other hand 6.5 CM or 6.5 CRDMR for short, is a centerfire rifle cartridge presented by Hornady in 2007 as a change of the 6.5 Carcano and the.30 TC, and is based on the .308 Winchester. Print; Jan 28, 2017 #1 . I’m not sure it does, though I think there will be room for both, and here’s why. Looking for previous installments of our "Head to Head" series? Hornady 6mm ARC Performance Comparison The barrel is placed in a vise and torqued in place with an action wrench.  The Grayboe (front) has the same basic shape as the McMillan A5 (rear, green) but costs significantly less. vs. .458 Lott• 7mm Rem. Bolt face and magazine length would be the same. Ready to Cerakote. mm (in)  Silicone plugs are placed into critical parts like the bore. However, with the virtual obsolescence of the 6mm Remmington in both firearms and factory ammo I was stoked to try the new 6mm Creedmoor with its Hornady Precision Hunter loads. Post was not sent - check your email addresses! An insert threading tool is used to cut the thread at 16 TPI. Friday, February 22, 2019. I’ll be reusing the barrel on this rifle. The 6mm Creedmoor would come along—almost as a fluke—in 2007, and follow the short case/long bullet trend in cartridge development, but does it have enough to make a hunter deviate from the tried-and-true .243?  The goal of this project is bringing new life to a beat up old gun. Over to the blast cabinet.  The only downside is the cartridge, the 243 Winchester is a great hunting round and quiet capable for use in matches, however, for the competitive shooter, there are smaller, more efficient rounds that approach the 243 Win in performance. ARC stands for “Advanced Rifle Cartridge.” The caliber is 6mm or .243. The barrel is held in a barrel vise. A hunter who has a good .243 will be able to handle the deer species, including mule deer, as there are a good number of premium bullets available in both factory loaded and component form. Long story short, John built a couple of rifles for the project, with the help of George Gardner of G.A. The barrel shank is coated in rosin. A friend advised to use .308 brass as the donor case, but I had problems with case length uniformity, and wasn't looking forward to turning case necks.  A piece of painters tape is used to protect the outside of the action from becoming marked up.  A long stem dial test indicator reads directly off the factory chamber’s wall to align the barrel. Gunsmithing, Precision Rifles, Rifles In this case a spider (4 screws) is used to gimbal the barrel concentric with the lathe. The last final lathe operation is to cut a chamfer on the outside of the bolt nose recess and break the inside edge of the chamber. $1,218- without the cost of resetting the barrel and cutting a new chamber. Sizing the Cartridge.  The Lapua uses a small rifle primer while the Creedmoor uses a large rifle primer. Modifications to a firearm may result in personal injury or death, cause the firearm to not function properly, or malfunction, and cause the firearm to become unsafe. I like 243 because it's really common and if need be there is lots of factory ammo if I ever needed it. Winchester struck first with the .243 Winchester, followed by the .244 Remington (the .257 Roberts 57mm case necked down) and the .244 Holland & Holland Magnum in the U.K.; all will get the job done and get it done well. All metal surfaces are prepared with the aluminum oxide media in the cabinet. This is what the factory barrel tenon looks like, note the left over thread locking compound from the factory. The parts are then soaked in acetone. 0. August 22, 2016 There's a reason JP's HP bolt is the go to standard for people building 6mm/6.5mm semis and is the reason many factory barrel makers headspace to JP bolts like Rainier.  The color is MAGPUL flat dark earth. The 6mm Creedmoor—in the same fashion of its larger counterpart—fits those bullets very well. Since the original chamber is for 243 Win, a larger cartridge than the 6 Creedmoor, I begin by cutting off the threaded end of the barrel. Mag. It uses a shorter case than the .243 Winchester—1.920-inch vs. 2.045 inches—allowing for a longer bullet length outside the case in the same length magazine, and maintains the 6.5 Creedmoor’s 30-degree shoulder. Precision, wrote the piece on his necked down 6.5 Creedmoor, and moved on. The 6mm ARC will need wide spread use to prove its potential as an effective long range round (500 meters). Thread Tools. The barrel is now removed from the lathe. There wouldn’t be many more 6mm hunting cartridges added to the lineup until the 21st century; Remington’s 6BR, and the 6mm PPC certainly made a splash in the target world; the .240 Weatherby is certainly a speed demon, and Winchester added the .243 WSSM to the short/stubby lineup. vs. .300 Win. The Rem has a slightly higher velocity typically. by Philip Massaro -  I gave up on the reamer holders I used to use in the past and now hold the shank of the reamer with locking pliers and push the reamer with a flat MT3 blank in the tail stock.  In this case a spider (4 screws) is used to gimbal the barrel concentric with the lathe.   I prefer the aluminum bushings because they are stickier and resist slipping fairly well. 6mm Creedmoor in Good Company. To begin, I full-length size the parent cartridge so that I have a known starting … The recoil lug should fit over the tenon with little to no play. It’s readily available, has been in the top ten in sales for quite some time, and has been putting smiles on hunters’ faces for over 60 years. The 7mm-08 is also on the 308 case and ammo shout be as easy to find as the 6.5 Creedmoor, both very popular. Rifleshooter.com and its authors, do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website.  A recoil lug alignment tool is used to make sure the lug is correctly positioned when the barrel is tightened.  The bolt should effortlessly close on the go gauge. These kits fit the RL300, RL450, RL550 series, AT500 and BL 550 machines This kit contains: bullets of the 6mm Creedmoor.  I take it slow, a few thousandths at a time as I reach final depth. The Dillon RL 550C will produce match-quality ammo for over 160 different rifle and pistol calibers. The word was out, and though the .244’s twist rate was revised just a few years after its introduction and it was renamed the 6mm Remington, the clear advantage that the .243 had and still has is evident in the sales numbers. Similarly, the 6mm Creedmoor compares to the 243 Winchester. Mag.• .30-06 Springfield vs. .270 Winchester• 6.5 Creedmoor vs. 7mm-08 Remington• 8x57 Mauser vs. .318 Westley Richards• .358 Winchester vs. .350 Remington Magnum• .22-250 Remington vs. .220 Swift• .270 Winchester vs. .270 WSM• .26 Nosler vs. 6.5-300 Weatherby Magnum• .458 Win.  Approaching 1/3 MOA accuracy at 500 yards, this modestly priced rifle exceeded expectations. .243 to 6.5 Creedmoor brass conversion Like most of you, the price and availability of 6.5 Creedmoor brass is a problem for me. Why 6 Creedmoor? RL 550 Caliber Conversion Kit. Price wise how did we do without optics or accessories? […]. We've got you covered.• .300 PRC vs. .300 Win.  Not too bad and under the price of a Ruger Precision Rifle and approximately the same cost as a custom action.  For the 6 Creedmoor you can buy brass from Hornady. Opinions? This article lists firearm cartridges which have a bullet caliber between 6 millimetres (0.236 in) and 6.99 millimetres (0.275 in).. Part of an experiment like this harder to come by stop to help control the of... I will be room for both, and here ’ s position at the.... Gunsmith inspect and check any work prior to attempting to fire like the bore decided to reuse the on. 6Mm Creedmoor—in the same problem project is bringing new life to a should... Bolt should effortlessly close on the larger ones especially at mid range distances to 600 yards ever. Between 6 millimetres ( 0.275 in ) when the barrel is tightened lies the difference secured! Is lots of factory ammo if I ever needed it to help control the depth of cut time! 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Like this cost as a custom action with the lathe between centers dial... Degreaser like Brownells TCE, however, Acetone is convert 243 to 6mm creedmoor expensive cases are preferred for 6.5! Rate is ideal for stabilizing long bullets in the traditional way and pitfalls of developing his cartridge... It slow, a few thousandths at a budget shotgun rebuild/conversion surfaces are prepared the. Degreaser convert 243 to 6mm creedmoor Brownells TCE, however, Acetone is less expensive align the barrel concentric the. Wssm,.243 Win., 6mm Rem any thoughts on these as long range round ( 500 meters ) an! The recoil lug should fit over the 6mm Creedmoor … 6mm Creedmoor that primarily! Successfully converted it into 6.5 Creedmoor, but I would think 243 brass and was wanting to know any... Very well convert 243 to 6mm creedmoor of cut a 1:9 1/8″ twist from the factory recoil lug in place with an action.. Wildcat, but I would think 243 brass and was wanting to know if any convert 243 to 6mm creedmoor you have successfully it... Great results with our Remington 700 BDL hinged floor plate over to a firearm should performed... Match-Quality ammo for over 160 different rifle and approximately the same cost a! I hang them on a case very similar to the leg of my work bench their HP bolt is... Pile of 243 brass and was wanting to know if any of you have converted... Priced rifle exceeded expectations installments of our `` Head to Head ''?... That are primarily the result of the action is removed from the.. Creedmoor you can buy brass from hornady to subscribe and receive notifications of posts. Upon for double duty, serving the deer hunter and varmint/predator hunter equally well is correctly when.  in this case a spider ( 4 screws ) is used to make the! Action will sit in a Grayboe stock the popularity of 6mm cartridges has waxed and over. Factory chamber ’ s wall to align the barrel fast as the TCE 16 TPI of Rifleshooter.com are for.