You are only limiting yourself by shooting minor... Minor has a different scoring system so you get less points for C's and D's. By shooting 40cal you limit the number of rounds you can carry. Like 17 vs 21 and 24 vs 29 in your big stick. 9 minor might not run an open gun very well either, the compensator is there to divert gas upwards and shooting minor you will have less gas and a slower slide cycle. That is why 99% of open shooter use 38 super/super comp or 9 major...