12 or 14?

[Mills]

Richard Hoover did some Parker Pages articles on 11 gauges and mentioned how Parker played around with bore and chamber sizes. Complicated but interesting

The best are the 12 gauges with 11 gauge bores. They pattern so well

[Mike McKinney]

I can understand why this would be confusing, it is to me. I think there are considerations that make it come together, as Mills states manufacturing companies were playing around with configurations of which some were standardized, remember the gun is well over 100 years old. With that said there are actual examples of 11, 14 and one of our most knowledgeable collectors is actively looking for a 13 gauge. The breech loading shotgun was a new thought as Parker began production, there was the brass shell, the paper shell and in the case of your gun the bore was bored to accept a shell which didn’t make the standard list. Nothing wrong, just a part of the evolution of a very fine and honored product.