I've shot numerous elk, nilgai, literally hundreds of hogs, close to 200 whitetails on high fence Doe reduction hunts, and many exotics on population control hunts. Barnes X is my favorite hunting bullet. Never had one fail. The 7 STW demands a tough bullet when using full throttle loads, after having Noslers literally fail at close ranges, Barnes was the ticket. Used them in 6mm, 7Mm,30 cal,.338 and .375. I shot an elk several years ago facing directly away from me and the bullet took out 15" of spine and lodged under the hide on his neck. Nilgai are notorious for their toughness, and thick elastic hide. Full broadside penetration crushing shoulder. For the high velocities of ultra mags and similar calibers can't be beat.