I have a newer remington 870 12 gauge that shoots 2 3/4 or 3 inch shells. For some reason i bought some federal 2 3/4 shells for shooting trap and they keep getting stuck in the chanber after i shoot them, i can get them in and out just fine when they are not fired and i bought some three inch remington shells and not one of them stuck in there. Any body know what could be cuasing this. Are they just cheap ammo and expanding after they are fired?