Both ~may use 45-70 as well, provided they can be ran through a re-sizer, Lee taper crimp 45 ACP die (#90785 ?). More so for the 450BM.
A multitude of grains to choose from, provided appropriate seating depth / LOA.
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Holy Necro post!
Suwamee Tim, any more input on the suppressor? I'm considering a can for a 450 bushmaster and have been looking at the SiCo Hybrid and the Bowers 458. This will probably get direct thread applied and left on a hunting rifle...
Here's THE site for 458 Socom info:
http://www.teppojutsu.com/458.htm
These guys and RRA are the only ones with the correct reamer chambers for the 458 Socom:
http://www.tromix.com/