I've shot thousands of rounds made by Winchester (WWB), CCI (that cheap aluminum cased stuff), Federal American Eagle, etc. I haven't had a dud yet. Guess I'm just lucky.
As far as clean vs. dirty, I usually shoot at least 500 rounds when I go to the range and have yet to find an ammo company that leaves my gun clean after 500 rounds.
As far as clean vs. dirty, I usually shoot at least 500 rounds when I go to the range and have yet to find an ammo company that leaves my gun clean after 500 rounds.