You need to do some homework.
458 SOCOM is basically an AR-15 on steroids. Similar to a 45-70, but in an AR type platform. Increased accuracy and decreased recoil too. Only need 1 round to put a person down for good. I don't know of any bullet proof vests and plate carriers that can fully protect you from a 458 round, especially the higher grain penetrating rounds.
458 is really not optimal for anything farther than 150 yards, so an expensive high mag scope not necessary. I use my Colt 6920 if my target is over 100 yards.
Putting a hand loaded .45 round is a improvement? I don’t think so
If I’m going to need a “ big hit” I can use a .45 handgun
I would not need to slow down the ar
I’d the barrel different in this socom?