Bad cylinder timing in brand new taurus 627. Options?

Hopefully this is my last question about my new 627. Thanks to all who have helped so far. I bought it online, but a local gunshop noted that the cylinder could rotate backwards a few time before catching, and he showed me while dry firing how though the trigger would pull, sometimes the cylinder would not rotate in DA mode. It seems to be the same two positions in the cylinder that have this rotation problem. Like an idiot, I fired a couple rounds through it anyway, and the second round was way off and cut a jagged hole trough the paper. That round nicked the breech and sent a crescent sliver of the metal jacket out onto the table. I know Taurus has a great warranty, but now I am wondering if the gun shop damaged the cylinder (the little locking grooves in the rear of the cylinder appear nicked) and I fear taurus may consider it abuse even though it was having rotation problems out of the box. Any thoughts on my options and worse case scenario what I may have to pay out of pocket?