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Old January 28, 2021, 06:45 PM   #18
Shadow9mm
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Join Date: March 21, 2012
Location: Indianapolis, IN
Posts: 2,058
Quote:
Originally Posted by FrankenMauser View Post
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.
You are correct, the heavier factory loads are only in the 300gr range at about 1850fps at the heaviest.

I was thinking more from a handload than factory ammo spec.
450 bush, case capacity 73.5g, pressure 38,500 psi
45-70, case capacity 76.9g, pressure 28,000 psi

based on the stats, even with the reduced case capacity, the higher PSI should more than make up the difference between the two and the 450 should out perform the 45-70...
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