1) When you grab a freezer bag full of 10mm moon clips and your handy de-mooner, it helps to actually put them in your range bag rather than leaving them lying in the attic. ~100 rounds of 10mm doesn't sound like much until you have to pop them in and out of your single moon clip with your fingers.
2) Georgia Arms 180gr 10mm @ 1100fps is pretty zippy stuff when fired in a Smith & Wesson revolver with no moving action bits to spread the recoil impulse over time. With a 3" barrel, and recoiling against a standing breech, there's a lot more sturm und drang than the same load fired from a 5" Colt Delta Elite. The stuff I had was actually Georgia Arms commercial reloads, rather than new-manufactured stuff. I actually encountered one round with a visible crack in the case. Luckily I caught it as I was loading the clip. I've never had a problem with Georgia Arms ammo over the fourteen or so years I've been a customer, so keep an eye on the ammo you use, no matter where you get it from; even the big companies can occasionally split a case mouth or seat a primer wrong. (Also, if shooting 10mm reloads, bear in mind that the round was, statistically at least, likely fired from a Glock, which can be a warning sign in a high-pressure round like the Big Ten.)
3) Even with Mag-Na-Porting and fairly moderate MagTech 240gr JSP ammo, a 3" S&W 629 can be a flinch-inducer. Maybe save that 'til the end of the range session...
4) Did you practice strong-hand only and weak-hand only drills today? If your gun malfed, did you practice clearing the malf rapidly and finishing the string of fire, or did you stare at the jam like a duck in thunder before clearing it?