Smaller than 13 bore but larger than 15.
In practical terms between 12 bore and 16 bore.
You must understand that the bore size (internal bore diameter usually at 9 inches from breech) is not necessarily the size of the cartridge the gun is chambered for.
A gun chambered for 12 bore cartridges, probably indicated on a British gun by 12 in a diamond, if tight bored could well be marked as having a 13/1, 13, 14/1 or 14 bore.
If it is chambered for 14 bore cartridges 12’s won’t fit in and 16’s will be sloppy in the chamber.
Last edited by Parabola; 05/19/22 05:05 AM.
