Not a PRC, but close! My favourite 7RM load is 69grains of H1000 ( AR 2217 here) with 160/162 g bullets of various flavours, mag primer, giving 2960 to 2980 f/s (depending which bullet). ADI lists 70 grains as max at a mild 49,600 CUP. Draw you own conclusions!
Cheers, Jack
