[Austin W Hogan]

My 3215, a $250 grade, is also a C12. I measured all my chambers with a plug gauge, not a bore mic.
Jim Parker's Eleven Ga lettered with B12 chambers. All of the 11 ga guns were made prior to 1875, when Parker flyers offered only 10 and 12 ga guns. Other gauges were available with a surcharge: ie Gary's first 20 ga. Do you think the surcharge should letter on the elevens?

Best, Austin