Small bore,
Can you solve this conundrum?
I have always had a special interest in early British hammer guns. Guns made pre 1868 were proof tested and proof marked to different standards to post 1868 guns.
For example a pre 1868 gun 12 bore stamped 13 G at proof could have a legal bore size in the range .700-.728 diameter.
Post 1868 the bore size were identified by diameter and stamped on the barrel as follows:
13 .710-.719
13/1 .719-.728
12 .729-.740
My 12G Daw of circa 1861,proof stamped 13 G has bore size of .725
Is this gun still in B.P. proof Bearing in mind that it was proof tested under the rules applicable prior to 1868?

Roy Hebbes