Squib308 said: agree sounds like an ammo issue. Probably the brass is bulging? Have you ever inspected the winchester brass before vs. just after firing? MGL Chapter a hundred and forty stated: “Massive potential weapon”, any firearm, rifle or shotgun: (i) that is semiautomatic with a set substantial potential feeding https://highimpactrounds.com/product/mossberg-590a1-tactical-12-ga-20in-8rd/