.177 for me at 12ft-lb
It gives less room for error with ranging, it's about the same on windage, and it's cheaper. Generally I'm more concerned with hitting the quarry in an accurate way for a clean kill, everything else is secondary.
I think it's pretty hard work with 12ft-lb. I'm not happy going further than 30 or so yds.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep