I've had the gun since 1977. There have been times when I haven't fired it for a year. The last few years I've been running two mags through it every 2-3 months. I've always used an assortment of ammo brands, but it's always been 230 hardball. Last weekend I tried two mags of Federal Champion, which I know I've used before, and it choked about every 3rd round. The mags are fairly new by the way. Went to my local gunsmith/gun store owner and he said, before you bring it in for me to check it out, try some different ammo. I got a box of Winchester White box and said I'd give it a shot. Two mags, right out the barrel. Loaded a mag with the Federals and third one choked. By that I mean didn't eject spent cartridge and tried to feed a new one. Cleared that up, reloaded with WWB, and no problem. It's our #4 backup in the bedroom, but I want it to work, and it's a lot of fun to shoot. First shot.