I have been running MRP in the 300 WSM
for about 4 yrs with great accuracy, velocity and low pressure, 30" barrel, 210s and 2975 fps. Bought 40 lbs and down to about 16 lbs left.
I used MRP2 in my 338 Lapua AI, same results.
Very low lot to lot variation and no issues with temp sensitivity in the MRP line of powders. Hard to get sometimes, right now Graf and Black Hills are the only distributors I think.