Does anyone know who makes a ar15 or more likely an ar10 upper in 6br? Or even if they just chamber a 6br barrel for an existing ar type rifle? I know there are quite a few people that chamber guns in grendel and spc based 6mm rounds but im specifically looking for the 6br. Id really like to stick with the 6br so i dont have to load for another round. Thanks
6br in an AR rifle
- Thread starter 69mach
- Start date
How would the bolt face be to big for a br case? I’d think an ar10 308 bolt would work fine. I figured it was more of a problem with feeding and cycling reliably.
Shep1
Kevin Shepherd
I’ve looked into all the spc and Grendel based wildcats and none of them spark my interest except for maybe the 6mm turbo 40
6mmAR which is a 6mm Grendel. Shoot a 95 grain match bullet in a 8 inch twist and you’re golden.
mensajd
Quod Erat Demonstrandum
Even if you get another gun chambered to the same cartridge, you'd likely still have to segregate brass for each gun if you are doing precision loads and minimal sizing. So the incremental expense of another "round" is actually de minimus if you select the same caliber bullet - just dies and brass.
243 WSSM in an AR-15 with a match grade barrel is pretty awesome and has the ballistics to reach over 1k yards. In other words, 6mm Creedmoor ballistics in an AR-15 platform...
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Brass wasn't my concern, primers bullets and dies were on my mind, and of course I just like that round
mensajd
Quod Erat Demonstrandum
Good point regarding primers. I missed that. But the incremental cost of going to another cartridge isn't particularly high. But a 6mm BR, due to COL issues requires an AR-10 platform which cartridge isn't commonly available in that platform. So due the major expense and weight increases with a custom AR-10 platform vs AR-15, I don't think expense arguments in favor of 6mm BR are compelling.
Liking the round and having something different are compelling considerations and the expense/weight tradeoff is up to you. I still shoot a .224 Wby Mag as a walking varmint rifle because it was my first premium rifle and I've used it continually for varmint hunting since grad school. Great memories and I don't care about the incremental cost of shooting it.
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mensajd
Quod Erat Demonstrandum
True enough, it's doable, but given the mag length constraints and relative case powder capacities, the WSSM is a much better long range round. SAAMI max COL length 6mm BR cartridges won't even fit in an ar-15 mag, so for mag length rounds, you'll eat into powder space more, further exacerbating the powder capacity issue. But by all means, buy what you like,
I talked to fred at sabreco I left a message and he called me back the next day and was very nice and helpful. Off topic the only other guy that was this helpful that ive talked to was bob white. Fred made a good case for the 6mm turbo 40. He said that it is what he would get for bench shooting. He said alot of his rifles maintain a 1/4 minute but I'd have to order through 6mmar.com since it was their proprietary cartridge, he just does the Smith work for them.
I don't think you'll be disappointed by either the 6mmAR or the Turbo version with 40* shoulder. I had a 28" Bartlein 6mm/1-7.8tw bbl in 6RAT done by John Holliger at White Oak Precision years ago, for an AR15 spacegun or match rifle, for NRA XC high power. John recommends a 2" longer gas system for AR bbls 26" and longer, which my rifle had. It was a very good shooter, ran exceptionally smoothly with excellent reliability - don't recall ever having an alibi while running it in the rapids. The 6RAT is very similar to the 6mmAR Turbo 40, formed from 6.5 Grendel brass. I did another 24" 6RAT myself for an AR15 used in DMR matches, and it's been a good rifle. One thing you need to keep in mind - the Grendel's casehead diameter pushes the limits of an AR15 bolt, leaving very little metal to support the fronts of the locking lugs. We used to buy Lewis Machine & Tool enhanced bolts for our 6RATs, which are made of a tougher, stronger grade of steel (SAE 9310) than mil spec AR15 bolts (Carpenter 158). When LMT stopped making these bolts, I started buying J-P's enhanced bolts, which are made of the same SAE 9310 steel as the LMTs were. I will never sell a customer a 6RAT bbl without including one of these J-P enhanced bolts.
When Howa came out with their Mini actions chambered for the 6.5 Grendel, I bought a bbl'd action as soon as I could find one. Pulled the OEM bbl & replaced it with a Bartlein 6mm/1-8tw in light Palma contour, finished at 24". Had to turn the shank down to 1.090" to better match the Mini action's receiver diameter, but now I've got a nice little rifle in a McMillan Game Scout stock that's plenty accurate, easy to carry, and a joy to shoot. The Mini's are catching on, and with their popularity, more upgrades & accessories are becoming available for them. When the rear action screw hole in the plastic bottom 'metal' of mine split, I was able to replace it with aluminum DBM from DIP that's a real improvement over the OEM plastic part. While there are a couple of other mini action rifles made in 6.5 Grendel (CZ527 & Ruger American), I prefer the Howa Mini, and in fact am looking at using another couple of these actions for projects based on the Grendel case.
When Howa came out with their Mini actions chambered for the 6.5 Grendel, I bought a bbl'd action as soon as I could find one. Pulled the OEM bbl & replaced it with a Bartlein 6mm/1-8tw in light Palma contour, finished at 24". Had to turn the shank down to 1.090" to better match the Mini action's receiver diameter, but now I've got a nice little rifle in a McMillan Game Scout stock that's plenty accurate, easy to carry, and a joy to shoot. The Mini's are catching on, and with their popularity, more upgrades & accessories are becoming available for them. When the rear action screw hole in the plastic bottom 'metal' of mine split, I was able to replace it with aluminum DBM from DIP that's a real improvement over the OEM plastic part. While there are a couple of other mini action rifles made in 6.5 Grendel (CZ527 & Ruger American), I prefer the Howa Mini, and in fact am looking at using another couple of these actions for projects based on the Grendel case.
Something to consider...As case diameter increases, so does bolt thrust, which is the weak link in the ar15 platform. I doubt you'd realize any benefit of the br case over the Grendel case in that platform, and as others have alluded to, the bugs are worked out beforehand. I suggest reconsidering a Grendel variant, but that's just me. If you look at saami max pressures for a 5.56 vs a Grendel, then run the bolt thrust numbers, the max pressures of the Grendel are proportionately less..in this platform and because of it. In a bolt gun, it is a different story. That's why some manuals offer service rifle load data as well as bolt gun data. I don't know if you'll find both data for the Grendel at this time. At least, I don't remember seeing bolt gun data for it. Regardless, with the larger case head area of the br, it WILL create more bolt thrust and thus lower max pressures. If you go ar10, disregard all of this.
I shoot a 6 and a 30 cal based on the Grendel in bolt action BR rifles and couldn't be any happier with the case, all the way around. It's a fantastic cartridge to work with, particularly so with Lapua brass. I just don't think you'll see any benefit of the slight capacity increase of the br case over the grendel. I'd lean toward a straight grendel case but an improved variant is certainly a viable option. Just my 2 cents worth on the subject. Before someone says the improved Grendel bolts will fix it...trust me, I've broken them too! They are better but are still the weakest link in the system and are not a panacea that will allow bolt action pressures from an ar15 rifle. Going to a br case will just compound the issue further, even if you were to use a grendel bolt with rebated rimmed br cases.
I shoot a 6 and a 30 cal based on the Grendel in bolt action BR rifles and couldn't be any happier with the case, all the way around. It's a fantastic cartridge to work with, particularly so with Lapua brass. I just don't think you'll see any benefit of the slight capacity increase of the br case over the grendel. I'd lean toward a straight grendel case but an improved variant is certainly a viable option. Just my 2 cents worth on the subject. Before someone says the improved Grendel bolts will fix it...trust me, I've broken them too! They are better but are still the weakest link in the system and are not a panacea that will allow bolt action pressures from an ar15 rifle. Going to a br case will just compound the issue further, even if you were to use a grendel bolt with rebated rimmed br cases.
gunsandgunsmithing hit all the points perfectly. Just buy your choice of Grendel based upper. Fred does great work.
I have a 6BR in an AR and I had a 6mmAR. I first bought the 6AR and then had the opportunity to buy the 6BR. My BR uses a PPC bolt and came with 700 pieces of new rebated rim lapua brass so it's been super easy for me to shoot. It does not shoot any better than the 6AR turbo I had for a couple of years. Only reason I sold the 6AR was because I also had a 6br bolt gun.
I never saw the need to push a 105gr much past 2800fps, just like the 6AR will do. I only use mine for NRA XTC matches and there is no real gain on a 600 yard target, no matter what it will use more windage than a 6XC. I think I have about 1500 rounds through it, no problems using the PRI 6.8 mags.
I have a 6BR in an AR and I had a 6mmAR. I first bought the 6AR and then had the opportunity to buy the 6BR. My BR uses a PPC bolt and came with 700 pieces of new rebated rim lapua brass so it's been super easy for me to shoot. It does not shoot any better than the 6AR turbo I had for a couple of years. Only reason I sold the 6AR was because I also had a 6br bolt gun.
I never saw the need to push a 105gr much past 2800fps, just like the 6AR will do. I only use mine for NRA XTC matches and there is no real gain on a 600 yard target, no matter what it will use more windage than a 6XC. I think I have about 1500 rounds through it, no problems using the PRI 6.8 mags.
Dusty Stevens
Shiner
Call it a 243lbc and anybody can build you one
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