Bad idea on the NBT for elk,I shot a bull at about 200yds with a NBT right in the shoulder blade and the bullet exploded to pieces.Yeah it broke his shoulder and he was not going to far, but I had to put two more rounds into him to finish him off.After that experience all I've used out off my 300WBY is federal premiums in either the barnes triple shock(shot two bulls-dropped both of them one shot)or the trophy bonded bearclaws(i think they discontinued them-but great bullet too).The NBT is a very accurate round and great for deer or smaller game,but for elk I'll stick with the barnes triple shock.The barnes is a lead free bullet so there is less barrel fouling than lead based bullets and I shoot one inch groups out of vanguard sub-moa and when it hits them you will usually find the bullet on the oppisite side in the hide(intact)