Squib308 claimed: concur feels like an ammo problem. Probably the brass is bulging? Have you ever inspected the winchester brass before vs. just after firing? I come to feel like being slide mounted on the centerfire pistol is about as severe mainly because it gets, and nearly anything that survives https://highimpactrounds.com/product/mossberg-590a1-spx-12-ga-20in-8rd/