I have used both powders in my .340 Wby. Mag., and with a 250 gr. Hornady using RL-22 MAX: 84.7 grs. I obtained 2,890 f/s; using MRP MAX: 90.0 grs. I obtained 3,086 f/s. I also obtained smaller groups with MRP. The only powder that came close to the preformance of MRP is WMR. Good luck.