The 2 Sierra Game Kings I have recovered travelled from front to back through deer performed very well.. Looked like a core lokt commercial. The 180 grain 30 caliber. fired out of a 300 Weatherby. The core fell out when I skinned the deer but the cup and core were still together it was just loose. I load speer boat tails for my son's 30-06 and the deer he shoots usually drop dead and the bullet always exits.Never caught one yet.They are cheap and shoot dime sized groups out of his rifle.