I do need to check the inertia spring. Fired hull ejects, new shell doesn't feed. Doesn't make it all the way up into the chamber, and gets stuck between bolt and feed ramp. Yes, this is with Win AA 1250 7.5 1 1/8.
As for the Aero slugs, 7/8 1300 has always run in this gun, until last month's match, where the spent hull stovepiped. Though at this month's match, the 3 I needed cycled fine.
Going to try new inertia spring, new Benelli ejector and spring, new mag tube spring, and see where that gets me. I'd try the MOA bolt carrier mod if they had welded up parts in stock.