Try an AR-15 in .458 SOCOM. It uses the same bullets as a .45-70 and uses an standard 5.56mm 30 round magazine to hold 10 rounds.
Great round if your up against bad guys with body armor or bad guys behind a cinder block wall. If they're wearing armor, it'll still knock the wind out of them and if they're behind cinder block walls, the wall will disappear after a few rounds.
Around 2000FPS for a 325 grain JHP and a bit less for a 505 grain hardcast lead bullet. Muzzle energy is in the 2000+ lb/ft range. Kind of like getting hit in the chest with a sledge hammer.
I’ve long wanted a supressed SBR in .458 SOCOM loaded with 600gr/1000fps rounds.
Interesting!
Had no idea about this round, even better that it uses the same mags as standard 5.56 AR’s!!
Damn expensive ammo though.