I'm running 27.0 with a 70 rdf. I didn't take my chronograph today but the ballistic program's prediction was bang on at 740 yds @ 3080 using a g7 of .211. I beat the crap out of a spot that was the size of a Hungarian partridge.
The last time I was seeing 12 fps spread, I came up .2 grains today the group @100 was in the .2's off the hood.