Well heres the breakdown of the Corbon load...using this info, the .223 has more energy so it should also be fine for grizz and elk right...? I don't really care either way, I don't use a .223 for anything but coyotes and I'm not a pistol hunter either...just want ColoradoLuckyDog to know what he's using...

Muzzle Velocity: 1300
25 yards: 1241
50 1187

Muzzle Energy: 1126
25: 1026
50 938

Enough for deer, but elk and grizz would be pushing it for a primary weapon, back up pistol is a different story...