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Old January 27, 2021, 02:50 PM   #10
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Join Date: August 25, 2008
Location: In the valley above the plain
Posts: 12,801
Personally, 450 bushmaster would probably be a good choice. As i understand it it is fairly similar to the 45-70, and it will run in an AR....
AR, yes.
Similar to .45-70? Not really. It does arguably better with light bullets, but falls on its face with "standard" weights for .45-70. Think of .450 BM as a lower pressure .460 S&W.

The bullets designed for .450 Bushmaster are generally meant to expand readily in thin-skinned game. Probably not the best option if you're looking for penetration in big bears.

You can side-step to .458 SOCOM for tougher rifle bullets, but you also take a velocity penalty and drop to 1,400-1,800 fps -- or less, if you want to use the 500-700 gr bullets.
Don't even try it. It's even worse than the internet would lead you to believe.
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