So last year I replaced the rear sight, sighted it in hunted three times with it for spring turkey, cleaned it, zero issues. This morning I travel just over one hour to my spot, get dressed and ready for the walk in and I placed a round in the chamber no problem, I then go and place a round in the magazine, it seems the diameter of the shell is to big for the magazine or the magazine's diameter is too small....Strange!!! Not sure what the issue is yet, and I sure didn't want to shoulder & fire a gun with a unknown issue. The shotgun is a 1187 Super Magnum 12ga, with the ShureShot Stock, the ammo is HeviShot Magnum Blend 3.5", been using this gun/ammo for about 5 or 6 years without a problem. Look at the slits on the shells.....Any idea of the problem?