Originally Posted by
plumbgun
I learnt that the bore was actually the NUMBER OF BALLS PER POUND OF PURE LEAD that could be made....I still don't understand what "12 bore" really means as applied to shot guns
You've answered your own question. 12 lead balls of 0.729" nominal diameter weigh 1Lb. Therefore 12 bore has a nominal bore diameter of 0.729"
Don't forget that where a patched ball is used, the ball diameter is less than the bore diameter to allow for the thickness of the patch.
I collect vintage Japanese air rifles & vintage Japanese pellets
Information sought about antique firearms with Japanese markings, do you have one ?