I read somewhere that Norma MRP is the same powder as RL-22, just made with higher standards, more consistent lot to lot. I don't know. I have a can of Pw Pro 4000-MR to try in my .300 WM, it's pretty close in burn rate.
Current load is 74 gr. RL-22, 180 NPT/NAB, which is very good.
It's time to check out some other possibilities, like 168 gr. TTSX/200 gr. NPT, etc. May try H-1000/RL-26/Retumbo/Magnum with the heavier bullets.
DF
