I hunt with a Browning Auto 5 mag 12 It has always been reliable with an occasional hiccup with light dove loads. It isn't designed to shoot 1 oz loads but I ask it to and it is usable.
This year at our annual dove hunt it wouldn't cycle at all the shot shells from Wal mart. I did a little reading online on some shot shells on shotgun sites. I read several claims that the lower priced shotshells are made with such cheap plastic now that they won't work reliably even in some pump shotguns because the shells deform when cycled through the action. I tried some better grade hulls the next weekend and it worked flawlessly. That could be part of the issue with some of these shotguns that are built well not working as they should.
