Put 75 rounds through a new 1178 Rem. with 3 stuck shells. Seems they didn't extract and the bolt gets stuck. Have to pull the bbl to unlock it. WW Rem 2-3/4 heavy dove loads. Wondering if it is an ammo or extractor problem. I looked at the rim and didn't see anything wrong, have seen same problem in 870 when the rim is bent. My mossberg and beretta just keep going without problems, same ammo.