I haven't been involved in this thread but when I first tried the 151AH I also started with benchmark. I ended up at 47gr 1/4 crimp @ 2980 fps average 1/2- 3/4" groups. After talking with Steve I moved on to PP Varmint and the TAC. Don't remember the powder charges of the top of my head but with both velocity was just north of 3100 fps. I was never able to get accuracy with Varmint (1.5-2") but was able to get sub moa (~3/4") with TAC before I quit tinkering.Did you ever end up finalizing this load? I am trying to run benchmark with 151 ah and would love to see where you ended up
Matt