6.5 PRC
- Thread starter AZgeek
- Start date
It's baisically an RCM case (ruger compact mag, parent case is 375 ruger) which is a tad slimmer than the wsm/saum cases. The wsm/saum AR10's were on the ragged edge of durability due to bolt issues and i'm not sure anyone's making parts for them anymore. I always thought an RCM case cut down to 308 length would be a better way to go for an AR10 magnum, but everytime a manufacturer uses that case for something they make it juuuust out of reach for the AR10 platform.
I'd love to have one in 7mm!
I'd love to have one in 7mm!
From what I see the OAL is too long at 2.9+ when ar10 mags dont go past 2.87 at the max, and most are about 2.84... why get so close? I guess you could massage it in, but how much MV would you give up and when I think semis, I think people are more likely to be shooting commercial ammo.
There are manufacturers that make winchester short mag and saum chambering s as well as many other calibers that will work on a standard dpms or Arma lite upper. Check out Accuracy Systems website. Carl can build you an upper in a variety of calibers. The SAUM case is better suited to work in standard mags. Saum cases are shorter, allowing longer bullets, and the case walls are thicker preventing case bulge/sticking in chamber. However, if you want a big caliber in an AR that is affordable and sub moa check out Noreen firearms bn36 long range assassin rifles!25-06, 270,30-06,7mm mag, 300 winmag, and 338 lapua.
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Converting a large frame upper for a short magnum requires milling the upper ejection port to open it up for the fatter case, and special attention to modifying the barrel extension feed ramps for proper feeding. 308/7mm/6.5 standard feed ramps are to far from center and not low enough. The 308 high pressure bolt has to be machined to accept the .535 case dia. Extractors can be a weak point if not properly machined and clearance is not adequate on barrel extension lugs. Also you can only fit 4 rounds in a ten round magazine.
The cases are already the same length more or less. Basically a 260 rem with a wider body.
I was doing a bit of reading on this scenario and there's a theme emerging about the volume of gas produced and the AR10 platforms ability to handle it. Can these new bleed-off gas blocks help in that regard? Maybe in conjunction with say a rifle +2 or 3 gas length?
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