What's all this talk of out of round [bleep]? New factory ammo was tight going in, after ejection it wouldn't go back in. First thing you should want to do is see if full length resizing the fired brass fixes it. If it doesn't then you know for sure its the chamber and not the brass. Probably a worn reamer used leaving a tight chamber possibly with even a rough finish, there's not 2 out of 10 smiths that fully inspect their work, if this one had it would have been caught before being returned to the customer.
Phil
