I am beginning to build some test loads for my RPR in 300 WM and was curious about what, if any, powder(s) showed good thermal stability and lot to lot consistency. I'll be loading mainly heavier bullets (190-225grs). I have 1lb cans of the popular wm powders: H1000, H4831sc, H4350, RL-22, and RL-25. Any of those a winner? Once I settle on a couple of good loads, I'll buy bigger jugs of powder.