I'm really curious to see how brass holds up to some of these crazy speeds guys are getting with the PRC. I can't put 57.8 grains of RL26 behind a 140 hybrid in my wife's PRC (proof barrel) without it trashing ADG brass in 3 firings and getting clickers. A few weeks ago I was out with a buddy and whatever the starting load with RL26 and the 156 (54.something if I remember right) left a massive ejector mark and stuck the bolt pretty good.
Hornady shows a max of 55.7 of RL26 with a 147 and I think that's a little more realistic. I'm really having a hard time believing Berger did any pressure testing or just quickload data on either the 6.5 or 300 PRC. Some of it seems beyond spicy to me.