I have heard about Game King failures. I take them with a grain of salt.

I reload Game Kings for 30-06 and 270 for deer hunting. I have taken many deer with them. My loads are not hot. The rifles like them. I have never known them to "fail". If they hit the deer right, the deer dies, Shoulder shots have not been a problem. I have had a few rounds pass through both shoulders (very unusual because the deer and I have to be lined up just right). A typical heart lung shot with a Game Kings leave a nice exit wound. The deer may run a little bit but dies fairly quickly.

I have tried different bullets from out of the box commercial to premium bullets. I have yet to see any real difference on deer. Shoot what the rifle likes and practice with what you are going to shoot and you will do fine