6mmar for single shot bench gun?

[TrxR]

Anyone here ever try making a single shot bolt action bench gun for 100 and 200 yard shooting using a 6mmar chamber? It is easier to form but was wondering if it would be as accurate?

Thanks

 

[7x57]

I suppose you could, but if you're going with a single shot bench gun with that bolt head, why would you not do a 6ppc? Probably the main advantage of the 6AR over the PPC is that it is made to feed from a magazine, on the other hand, the PPC has dominated short range BR forever. No reason why you couldn't do it, but you'd likely lose to a PPC in that game.

 

[TrxR]

Its easier and quicker to form than the PPC.

 

[GSPV]

Yep. Just neck down 6.5 Grendel and go shoot.

The 6 AR is a 70 thou long 6 PPC. That's the problem. The PPC capacity is perfect for the mid 60 gr benchrest bullets at the right velocity.

If anything, the PPC might be a little too much. I know a guy that shoots a 6 Tyger that is a short PPC. He shoots a different powder and is very competitive. And his barrels last longer.

Now, if you jumped up to a heavier bullet and a faster twist, found the right powder, maybe 8208XBR, H4895, or Varget, perhaps you would find another winning combination. At 10.5 lbs, the recoil might be an issue. Maybe not as Mike Stinnett does it with a 30 Stewart. There are people shooting 6 BRs that way in UBR where all the guns are 13.5 lbs and the 30 cal has no "bigger hole" advantage.

Just my $0.02.

 

[GSPV]

If you, instead, neck the Grendel up to 30 to form the 30 Major, I guarantee that you will like it. Talk to Mike at http://www.ezellcustomrifles.com . He came up with it.

 

[Sling]

I thought about that cartridge in a 600yd IBS setup. Using Berger 105gr Hybrids, it is very close in performance to a 6BR.

 

[GSPV]

I believe that is what Jerry Sharrett is using it for. I believe that his cartridge predates the 6AR and even the 6.5 Grendel.

 

[gunsandgunsmithing]

I suppose you could, but if you're going with a single shot bench gun with that bolt head, why would you not do a 6ppc? Probably the main advantage of the 6AR over the PPC is that it is made to feed from a magazine, on the other hand, the PPC has dominated short range BR forever. No reason why you couldn't do it, but you'd likely lose to a PPC in that game.

Yep. Just neck down 6.5 Grendel and go shoot.

The 6 AR is a 70 thou long 6 PPC. That's the problem. The PPC capacity is perfect for the mid 60 gr benchrest bullets at the right velocity.

If anything, the PPC might be a little too much. I know a guy that shoots a 6 Tyger that is a short PPC. He shoots a different powder and is very competitive. And his barrels last longer.

Now, if you jumped up to a heavier bullet and a faster twist, found the right powder, maybe 8208XBR, H4895, or Varget, perhaps you would find another winning combination. At 10.5 lbs, the recoil might be an issue. Maybe not as Mike Stinnett does it with a 30 Stewart. There are people shooting 6 BRs that way in UBR where all the guns are 13.5 lbs and the 30 cal has no "bigger hole" advantage.

Just my $0.02.

I'm not sure that it has been proven, that the 6PPC is the end all, be all of benchrest accuracy. It certainly is GREAT, but has a cottage industry built around it and 99+% of group shooters shoot it. The mere fact that everyone shoots it, in and of itself, speaks to it's domination of group shooting, today, and the industry supporting it and information related to it, certainly support it in dominating group shooting.
But what if we had the same cottage industry and support around the cartridge widely called a 6mmAR? What if we had great benchrest quality bullets from every supplier in the 70-80 grain range, to optimize the case's capacity in the way the mid 60 grain bullets do for the ppc capacity? How about powders?


Both cases have a lot going for them. Both have great brass with small primers and small flash holes. There are currently some very good 80 grain bullets available, now. We may well find a powder that is currently available to be as good or better than the 133/ppc combo for it...


Maybe it would prove to be a tad too overbore, so what if a 6.5 Grendel had the same support and components?


Personally, I think if someone pursued the 6mm AR enough, that the difference between it and the ppc would come down to bullets, barrels, and trigger nuts.


There doesn't seem to be room left for "earth shattering" improvements in accuracy, when we look at what the guns we have now, are capable of. Convincing 99% of shooters and the ppc cottage industry to change won't be easy. The good thing about that is, you don't have to...Just build it and shoot it. There are pro's and con's to both, but there is a sizable segment of the 30BR crowd, that believes it to be superior to the ppc in terms in inherent accuracy. One could argue for either case.


You don't see many ppc's winning in the IBS or NBRSA score game, and you don't see many 30's winning in group, but one has to wonder how that might look if there were pretty equal numbers of different calibers and cartridges, shooting side by side....


Go look at the UBR http://ultimatebenchrest.com/ website. That's where you can see just that. The mix AND results are remarkably even.


Food for thought....


Mike Ezell

 

[GSPV]

I was thinking about a 10.5 lb 6.5 Grendel running Bob Cauterucio 80-something gr customs and 4895 at one point. Then UBR came along. No sense putting up with extra recoil AND being at a disadvantage shooting on the 30 cal target...

 

[TrxR]

We don't shoot for group here. We shoot for score. Now the odd part is one club scores up the other scores down. Both targets are the same dimensions.

Thanks

 

[BigDMT]

I recently built a 6mmAR Turbo 40 with a .269" neck in a bolt rifle. It's actually the Les Baer variation called the 243 LBC Turbo 40. Same thing. Just the 6mmAR with the shoulder blown forward and knocked out to 40 degrees just like what a Dasher does to the 6BR case.

Barrel is twisted 1 in 8" for the Berger 105's. Have not fired it yet as I am still trying to find the time to form up some brass. But I can keep you updated on my range reports if you like?
I hope to start breaking the barrel in and shooting some groups with it here in the next couple weeks.

 

[Hoier]

I'd be interested in reading your findings on the 6mmar. Keep us posted.

 

[jerdebson]

Please do keep us updated on your 6MMART40. I am just getting my 6MMAR(P) in an AR up and running. I have wondered what a setup like yours would be like.

 

[mao0720]

I have a 6mmAR that I am using for my start up rifle in Mid range prone matches and I just put together a 6.5 grendel for a whitetail rifle for my wife. I am seriously considering building a bolt gun on one of these two cartridges in the future, if for no other reason than because it would be cool. Would make great mid range prone or F-class rifles.