I don't know that I ever have, but I wouldn't worry about it too much if I had to, or just wanted too. I do know I've never fired one near as much as I read here and on other forums people say they insist on before they'll carry one. Take it to the range, shoot it, it works (it always does) and I'm good to go. Never had one that didn't work with whatever kind of ammo I shoved in it either.
Right now, I've got a Smith & Wesson 669 on my desk that I haven't fired yet. Planning on going to the range with it later today, but it wouldn't worry me to load it up and go with it if I didn't have anything else.