Took my model 64-2 snubby out shooting today for the first time. It was acquired in a trade, and the first 6 rounds were fine, but then it started binding after the first or second shot. Kind of like the equivalent of a jam in a semi-auto... The cylinder just did not want to cycle. It took quite a bit of effort to even get the cylinder open when this happened. Sometimes I could open it, and re-lock it and it would work for another round or two and then lock up again. Any ideas as to what would cause this? Dry firing on an empty cylinder did not produce any malfunctions - cylinder cycled properly. I was using Winchester White Box ammo. Gave it a thorough cleaning when I got home and didn't see anything obviously wrong with it, but I won't know if it's going to do this again until I get some shooting time or get some snap caps for it. I've not heard of a revolver doing this before, especially a Smith...