I read of people really putting the coal to powerbelts. I wonder if this could actually cause them penetration problems. Perhaps that powerbelt is hitting and basically shattering with the extreme velocity. I personally shoot them with 90 grains of Goex 2f. I have no idea of the fps of that load. Also I have yet to get a deer to stand still long enough to test one in a penetration test. Maybe this year.

Still Frontier Gander's pictures show that the bullet appears to have done exactly what it was intended to do, with a simple 70 grains powder charge. Again, really interesting....