My NewEnglander .50 seem to prefer short conicals. So far the best performer is a Lee 320 gr REAL. I've tried other (longer) conicals and didn't get nearly as good of groups.
I'm thinking of trying either Buffalo Ball-ettes or Hornady PA Conicals. Any suggestions on where to find them?
And any guesses on what kind of accuracy to expect?

Oddly enough, the second best shooting projectile has been a 350 grain .458 (Lee R/F nose design)cast lead bullet in an MMP orange sabot.