Best data I could find was, RL-25 assuming 160 gr bullet, for 270 Wby Mag, Pressure test loads (1 ea) 68.2, 69.7, 70.5, 71.1. Accuracy test: 69.5, 69.9, 70.2, 70.6, 70.9, 71.1., I shoot 5 shot groups, recording speed, and MOA.
When starting with an established cartridge I go to Nosler's site...