I'm getting in late on this, but have to put in my 2 cents worth. Used to load 300 XTP's and gave them up. I know that one shot is not a good test, but a few years ago, I took a 155# boar at about 40 yards. Muzzle velocity was about 1525 f/s with a 300 grain, 45 caliber XTP. Shot was broadside and it failed to exit. Bullet was found under far side skin without jacket. Since then, I've gone to exclusively cast and have yet to recover a bullet from a broadside shot. Never hunted elk, but bears aren't any tougher than a hog and they don't have a gristle plate to penetrate. Remember, if you start with a 45 caliber bullet, it's as big as a 30 caliber wants to expand to and you get the added benefit with the beginning of the hole at full caliber. Besides that, with a well designed cast bullet such as a Keith or any other with a large, flat meplat, you get the added benefit of "slap" on target which opens a big hole from get-to-go.