I have a couple smith and wesson 686's, the other week i was shooting some 357 reloads when i had a primer get pierced and come out of the primer pocket. I figured that was an overcharge due to the fact that only one did it and they were reloads i got from another shooter. Last night at the range i took the same gun out with some 38 special loads 160gr round nose lymann with my usual load of 3.2gr bullseye and was having primers back out of the primer pockets slightly, but enought to tie up the gun. I tried a few rounds from another box, same thing. I then tried those loads in my shorter barelled 686 and my fathers R8 with no issues. Up until I pierced that primer i havent had any issues with the gun. Any suggestions what to look for?