Like was said above 9mm for Production, .40 for L10, Limited, and SS, .38 SC for revolver since the rule change, and 9 Major or .38Super in Open. I did run .40 minor in Production and liked it. Best check the rules to see what's legal before you buy anything.
Team CARVER Custom
GSSF & NRA Life Member
Steel Challenge, USPSA
PM Black Diamond 538 F&AM
Bamatrooper taught Chuck Norris how to shoot.