Be interested in what you find with the R26. The 147s run 2725 out of mine over H4350 and getting short, I picked up some 26 to see if I could find some additional velocity. No joy in the 6.5 version, but had some good gains in the 6 CM with 105s...

IMR 4350 in the 6.5 looks like it's going to give me about 60 FPS gains, still with single digit ES, SDs.