Big bore AR: 50 beowulf, 458 socom, or 450 bushmaster?

[L1A1Rocker]

I'm thinking about a big bore AR but don't know much about them. I'd most likely cast my own bullets so the expense of bullets is not a factor for me. Also, are all three proprietary brass? I'd like to be able to make my brass from existing stock - like the 300blk is made from .556.

Well, that's my thoughts so far. Any of you with knowledge on this and/or experience, it would be great if you'd share.

Thanks

[Pikeman]

I went .458 Socom. A rock island upper on a Polymer Lower. I get my new brass from Starline and used brass on gunbroker. Lots of casting possibilities for this load. No alterations needed for AR mags but some carve out a small bevel at mouth of mag to assist flat point bullets. To justify the build I took it boar hunting. SST tipped 300 grain bullets cause piggy to crash on impact. No tracking required.

[Schuetzenman]

I have no feed back on this topic. Thought about one a couple of times but never got serious enough to really dig in on the topic and investigate it. Personally I'd go with one of the .45 cal variants. I can't imagine needing heavier bullets for anything I'm ever going to see in North America.

[Schuetzenman]

So have you made any decision?

[L1A1Rocker]

So have you made any decision?

I'm leaning toward 458 Socom right now. There is a very good selection of bullet molds for it. I'm tending toward the heavier sub-sonic loadings for future silencer use.