Harkrader, I also concur that your most likely problem is that junk steel ammo. You didn't have a bit of problem until you tried running that junk in your NG. Stay away from all that cheap junk.

If you want to shoot some (relatively) inexpensive ammo, look to someone like Freedom Munitions, who sells both new and re-manufactured ammo. And they use brass, boxer primed cases and even if you don't reload they have some kind of brass credit program to save you a little more money on ammo costs. In 357 Mag, they have some plated 125 grain ammo for less than 30 cents a round and you can catch them with free or reduced flat rate shipping at times too. BTW, I'm not affiliated with them in any way; just trying to help you save some money and stay away from steel and aluminum cased junk in your expensive revolvers.