I put 50 rounds of carry ammo through my pistols when I first get them. I've got Glocks and a Ruger P97, which are both known for reliability. The only wheel gun I carry is a S&W 638 Airweight, I put 50 rounds of range ammo through it, and a couple cylinders of +P+, just to make sure there were no burrs or loose parts.
The only gun I've run more than 50 rounds through before carrying is my new Kahr CW9. They can be a little finicky, but mine was fine with 200 rounds of WWB range ammo and 50 rounds of carry ammo. (Federal 135 grain bonded +P)
Some guns are more finicky than others. Glocks and XD's are usually good to go right out of the box, with just about any ammo. Other makes may need some experimentation with amounts of lube that they like, certain bullets they like better, etc.
Whatever you do, always test your exact carry ammo before carrying. The middle of a gunfight is no time to find out that your pistol doesn't like your ammo!