This is in my hunting rifle; I have a Tikka T3x in .308 with 22" barrel and I shoot 50.4 grains of 2000-MR under 168gr. Bergers in Norma brass for 2785 fps and no pressure signs. . .ES/SD are 11/5. I didn't get into pressure until I hit 52 grains and that was only slight primer flattening. I can hold consistent 1 3/4" groups at 200 yds. I shoot my rifle throughout the years and all over the Southeast (I live in N Central Florida) from 100 degree swamp days to below freezing N. Alabama farms and really haven't noticed any temp instability. . .but I'm also not shooting over 500 yds., so thats not saying much for the match shooting realm. I began my load work-up at 48.5 grains and bumped up in .3 grain increments up to 52 grains. 50.2 to 50.5 gave my best ES/SD, then I fine tuned with seating depth and slight changes in powder charge. I was a long time Varget lover, but the velocity advantage plus accuracy I received with the 2000-MR was a no brainer. I've since switched over several calibers to the 2000-MR.