Just send it back to SW. Call them and they will email you a shipping label. All on their dime. You will have it back in 4 weeks. I know it sucks.

Truth is there seems to be an issue with the timing on 7 shot revolvers from SW. I had two new ones I had to send back as well. I asked a buddy of mine who owns a gun shop and he said the same thing. Never timing issues on any new SWs but the 7 shot ones. Not uncommon for him to send a few 7 shot guns from time to time back for timing problems.

SW will make it right for sure. No hassle, just out the gun for 4 weeks.