I shot a cow elk at about 100 yards with a Sierra Gamechanger just a few days ago. It was the .308 dia. 165 gr. bullet with 56 grs. of H4350 loaded as a 30-06. The bullet went right through the heart leaving a fairly small hole on each side. I did not recover the bullet. I have seen other brands of bullets do much more damage to an animals heart. See photos.