bmoore No pissing match here I'm relating what I've seen hunting yotes with the AR as well I have yet to see what you've seen with 55 gr SP. In fact just the opposite. I shot two with 55 gr SP and got complete pass troughs and no blow ups. Nice .223 hole in and about .5-.75" hole out! Both were DRT on the spot with major damage to heart /lungs. I have no doupt what the outcome would be if I put two to the chest of a BG. DRT on the spot. If you want to step up in wt the 63 SEI SP is also a very good bullet. And you will not get any blow up with that bullet.