If you're shooting Limited, .40 is the way to go (although current rules about stage design are making .45 more viable again). .45 is popular in Single Stack Division. Production was designed to be minor caliber, 10 round maximum, off-the-shelf kind of stuff. Of course, you give gamers ANY wiggle room and you end up with customized all-steel CZ's dominating the division at the national level when probably none of them would carry that gun as an EDC piece.

My hat is always off to folks that shoot what they carry (or at least close) in competition. I'm still shooting my Glock 35 which has 90% crossover with my 22. Well, until I break bad and start shooting my STI 2011 again. No plans to do it anytime soon, but I can't deny the STI is a finely tuned machine that is a blast to run.