The marks on the face of the hull are typical for what you see fired out of an 870, 3MACS probably has the right answer on the primer, didn't realize Winchester still used some of the old style primer is certain loads. For whatever reason, certain years of Supermag are bad for this, whereas my 870 Express isn't ammo fussy, one of my members' Supermag has a serious hate for Challenger ammo, Winchester Universals and certain other low brass ammo will stick in just about anything.
Now to the next question, are the hulls sticking in the barrel or failing to clear the ejection port?
This gun HATES CHALLANGER AMMO! And no once it pulls them out of the barrel it flings them right out the barrel..... the shop just called me they are going to re hone the barrel and the lip where the brass sits or I need a new barrel...... sucks she is my first gun and i really wanted her to work right off the bat...... barrel Price is about 380


















































