I can attest to what wobbler, Superdude and some of the others are saying. I've been running 38 super since 2000, 40 S&W since '98, and am getting ready to start 9mm Major and I don't even own a case gauge. Just use the Lee/EGW undersized sizing dies, and if you're working with range brass or severely bulged cases, clean 'em up good, lightly coat them with case lube and they will size smoothly and easily. You'll find it's always best with an open div gun, to "knock the dust off" your top-end between matches anyway, so while it's down, simply "chamber check". It's definitive.
Bud Berthold