First off the factory rifle usually has a 12 twist which wont stabilize a 77 gr bullet. Second, if you hit them with a 55 gr. bullet ( which it will stabilize) at 300 yards, it will kill him.
Sorry, I should have been more specific. (OP edited) The rifle that I'm buying is a Howa Mini chambered in .223 Rem, which has a 1 in 8" twist so no stability issues with the 77 gr pills. I was more concerned about bullet capability.
