Smith & Wesson are good people. 800 rounds isn't anything and that's little more than 3 months of semi-regular training schedule at my house with any new carry piece! As for the ammo you use in your new issued Revo, I'd make sure to use factory loaded, brass cased ammo to break your new carry baby in and keep an eye on the firing pin bushing/same area of damage in your returned/pictured piece. I'm betting that was a freak occurrence or a bad batch of ammo with fatigued primer pockets as someone already has stated.

And unless something has changed recently a manufacturer can send you a replacement firearm or a factory repaired firearm to your door. Springfield did it with my 1911 2 years ago. Doesn't matter much either way you are getting a new piece.