SRH78 wrote:450 Bushmaster = .451, the same as 45 ACP, 45 Colt, 454 Cassul, 460 S&W etc...
458 Socom = .458, the same as 45-70, .458 Mag, .458 Lott, 450 Rigby, 460 Weatherby etc...
If you reload for the 450 Bushmaster, the 230 gr fmj bullets for the 45 ACP would probably be ok for punching paper but if you plan to hunt with it be sure to use bullets designed for the 454 and 460. The 45 ACP bullets will not even come close to holding together. I once loaded some 230 gr HPs for shooting varmints with my 454. At longer distances, they literally came apart before reaching the target.
I'm not familiar with a load where 230gr .45 bullets are recommended. I guess it's _possible_, but I'm certainly no expert on thumper loads (or any other load for that matter

).