Try loading the 124 gr Hammers with Reg LR primers and N560 . Steve of Hammer bullets posted he discovered more vel potential with the prc using LRPrimers instead of Mag primers he had a 200 fps or so vel gain up too 3470 fps with the 124 gr hammers and N560 . Also the 131 gr Hammer is designed for the 1-7.5 twist . I don't think you hear a lot about this bullet because most prc ,s are in the 1-8 twist . I load it too 3200 fps , but should be able too push it harder with LR primers and N560 or N165 . I load the 109 , 121, 123 , 124 and the 131 gr Hammers in 4 diff rifles and they all are very accurate.