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ARs and different chamberings

If you could get any of the following cartridges in a AR and not worry about bolt or barrel strength at 60k psi which would you choose? Just pick a caliber that you would like to see in a small semi auto, AR like platform.

6BR,6.5BR, 7BR, 30BR,38gr cap)
same calibers based on a 284x1.5 case like the 30RAR,44gr cap)
same calibers based on a wssm case,58gr cap)
 
Look very carefully at the 6mmAR Turbo by Robert Whitley. This is very close to an optimal cartridge. 6.5 Grendel parent case. Jerry Tierney has been using the 6mmAR and 6mmAR turbo with great success.

For deer hunting... something like a 7mm RAR might be interesting. But why, in heaven's name I'd go hunting with an AR, if I had a decent, light bolt gun.
 
I'm a 6.5mm fan, so that would be the bullet diameter.

BR class cartridges would be my first choice if there's no feeding problems. Plenty of good brass avail, minimal brass prep etc.

RAR class cartridges appeal to me because they're single stack in AR mags and thus probly feed well. Capacity wouldn't be too much either, only thing I'm sceptical is where to get good brass without too much prep.

I wouldn't go WSSM route, since it's too much capacity for me in AR-15, and I've heard nothing good about the brass situation.

For close quarter hunting, the RAR would also provide a good basis for something in, say 358 caliber,both pistol and rifle bullets available for different muzzle velocities). That is, if you're not satisfied with the original 450 Bushmaster.
 
Moderator said:
Look very carefully at the 6mmAR Turbo by Robert Whitley. This is very close to an optimal cartridge. 6.5 Grendel parent case. Jerry Tierney has been using the 6mmAR and 6mmAR turbo with great success.

For deer hunting... something like a 7mm RAR might be interesting. But why, in heaven's name I'd go hunting with an AR, if I had a decent, light bolt gun.
I have a cat similar to Whitleys and 8 others this year, I build custom ARs as a business. Just wanted to hear some opinions of what OTHERS would want.

Jthyttin,
For an across the course rifle a BR of some caliber makes sense
and in the tactical game a 6mm is flat shooting, dies and brass are available. These will actually double/stagger stack in a 6.8 mag.
For hunters a 6mm is a little light IMO, and I already have a 6.5 ARSM and .338ARSM based on the wssm but with a shorter neck so I have room for a small amount of leade.
At this time I agree on the RAR cases but it could open up possibilities when brass is available, cutting a .284 down and turning necks from .034 -.012 is a lot of work even for me.
 
Isn't the limitation faced with "up-cartridging" the AR-15 as much one of bolt strength as it's the diameter of the barrel extension & metal remaining, once the barrel's chambered.

Is it prudent to run with so little metal at such a critical point?
 
spclark said:
Isn't the limitation faced with "up-cartridging" the AR-15 as much one of bolt strength as it's the diameter of the barrel extension & metal remaining, once the barrel's chambered.

Is it prudent to run with so little metal at such a critical point?
Don't worry about the strengths or weakness of a AR15,I guess I should have added barrel in the first post too.
Olympic and Dtec has sold thousands of wssms with no failures so even that platform can handle the wssm at 65k.
 
I try to match cartridge to the weapon. I try to keep my AR-15s relatively lightweight, so the recoil should be low. Of course this means I'm giving up something in performance, but there's other guns for that...

As I said in the other thread, I welcome the 30RAR. Even just for the brass, because it makes wildcatting for AR-15 much easier. Many of the wildcatters are just looking for a new upper for e.g. hunting, so brass quality isn't that important.
 
I do not know where you got the idea that you could fit any of the cartridges you listed in an AR, but they are all unsuited for any number of reasons, varying from "won't fit" to just plain dangerous.

Don't try it.
 
RickB said:
I do not know where you got the idea that you could fit any of the cartridges you listed in an AR, but they are all unsuited for any number of reasons, varying from "won't fit" to just plain dangerous.

Don't try it.
I am assuming you didn't fully comprehend the first post.
This was a very simple question, I am fully aware of the AR15 shortcomings.
 
RickB said:
I do not know where you got the idea that you could fit any of the cartridges you listed in an AR, but they are all unsuited for any number of reasons, varying from "won't fit" to just plain dangerous.

Don't try it.

Not sure how you justify this statement as the 6mmAR has been around for several years doing very well and BR Armament Technologies is making an upper in 6mmBR that is also doing well.
 

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