Shooting informally this weekend at my buddies farm we only had my 500, bone stock nothing added but a recoil pad on the stock. I have had zero issues functioning the gun but I have had my father and my friend have a new shell drop while functioning the gun. I do no understand how it happens. I watch and they do it same way as me, speed i do not believe is much different, its not tipped or anything, and every once in awhile they will have a shell drop and not be loaded into the chamber. Anyone have a similar experience?