Well, let me put it this way...in a former life as a law enforcement officer in a very rural area, I used an AR-15 quite a bit on dogs chasing and killing deer , and also on deer that were injured by cars and dogs. Many of the deer were still able to run and had to be tracked down to be put out of their misery. Most of the ammo I used was handloaded with the Hornady 55 gr. FMJ. It was extremely effective and I could not tell any difference between it and the military bullet (or any expanding bullet either, for that matter) on live targets. The Hornady was not quite as streamlined as the military M193 bullet but it was accurate and never lacked for punch on animals up to 200 lbs. Personally I thought it fragmented just as well as the M193, but I never did any autopsies to find out for sure.