I loaded several boxes of target loads using Remington Black 16 gauge hulls on a mec 600 jr. I shot twice before attempting to open my AYA #2. I had to use lot of force to open the gun. Firing pin drag on the primers and part of the brass is visable. I tried 2 more rounds from a different box with the same results. I shot factory loads the rest of the day with no difficulty opening the gun. The primers on my reloads are flush with the brass and I can see no difference between my Remington reloads and factory ammo. I'm thinking that the problem might be with the resizing adjustment and I intend to mic the base thickness of factory and my reloads. Anyone have a thoughts?