"...USGI ball..." Not made for hunting. Milsurp ball is illegal for hunting in most places too. SP's are made for hunting. The Corbon is supposedly a solid copper bullet. They don't work like lead core bullets.
A Speer 110 grain HP with 14.5 grains of IMR4227 blows a hole the size of a grapefruit in a ground hog. Feeds with no fuss whatsoever. Never got a chance to use it on deer, before the carbine was declared evil, up here. Wouldn't think twice about using it under 100 yards though. Shot placement is essential, of course.