Thanks Gene, that is very helpful.

The barrels would have been proofed on the action and at the same time, but the Patent use marks could have been applied to the action prior to barrels being fitted.

It was originally London proofed as an 11 bore.

As the Birmingham re-Proof is at 19.7mm I would bet that if it ever was rifled it is now a smooth bore.

Last edited by Parabola; 01/18/23 07:57 AM.