Bought a 629-4 .44 S&W Mag from a fellow member here and it has been sitting in my safe for a couple of weeks. I took it to the range today and put 12 rounds of light target loads for a warm up. I noticed that after the second cylinder full of ammo when I went to open it, it was a bit hard to open. I put in some winchester factory loads and same thing when I opened the cylinder to dump the empties out it was really hard to open. I removed the ammo and thought I better stop and figure out what is going on. Looking at the cylinder and frame everything looked like it was in order. I closed the cylinder with no ammo in it and it was much harder to open this time. I closed the cylinder again and now I can't even open it. Any idea's?