Got the 300PRC to the range finally for ladder testing. Used 225gr ELDM'S, RL-26 and 215m primers. Barrel is 26" and 9.5tw.
Found two nodes: 74.1gr - 2856fps, 76.0gr - 2937fps. Slight ejector swipe at 77gr (2974fps), primers were still round and no noticeable increase in bolt lift. Stopped...