Truncated cone boolits seem to "smack" and "grab" pins when properly hit. I think the driving band does the grabbing, the meplat does the smacking. Look at a well-used pin sometime. The covering stretches to allow a RN bullet to pass thru with hardly a hole. TC boolits cut a hole in the cover. Look to the history of the game, you'll find it was designed to put the guys shooting light & fast projectiles at a disadvantage. Momentum and energy transfer are the keys here. I've gotten by with 200 gr target loads but if I were to get serious about it I think a 220 gr TC boolit would be pretty awesome as I tend to prefer decisive hits over speed.