I think MRP II is a different lot of RL-25.
One of the powders I tried with my 264 was N-560. In Europe, the 264 is lightly loaded pressure wise,so the VihtVouri data has N-560 maxing at 2900.Well, Lymans has some healthy charges of RL-22 for the 264. I found N-560 and RL-22 match up grain for grain in a 338WM,so me and my trusty chrony went exploring. Guess what,the velocity remained the same even with more charge at 2950.
Both Magpro and Magnum worked for me,Magnum the better of the two.When I got a 1/2" group at 100m at 3150 with my 24" barrel, I knew I struck gold.
