Do I have a Brass or Chamber problem?

[skb2706]

Without actually seeing it but based on what you have stated you have "no problem". New brass that expands .001"- .0017" to fit your chamber is not at all uncommon. Where are you measuring the brass at ? Often in break action guns it is necessary to bump the shoulder back to get proper headspace on once fired brass and it is also not uncommon for the brass to not chamber well after firing but prior to this process of bumping the shoulder back. I would not let it concern me much that fired brass does not chamber....it would serve no purpose if it did.