I have 3 Merkel SxS's in 28, 20, and 12 gauge. the bore dimentions are on the bottom of the barrel flats. The bore measurements are very close to standard published dimentions, if not slightly overbored. The chokes on all 3 guns are marked IC/MOD, and all measure .008" and .018". Odd indeed, but the big mystery to me is that all 3 throw beautiful IC/MOD patterns. I had the barrels measured at each purchase and found that the forcing cones in the choke area are somewhere around 6-8 inches long.
I have 2 Browning BSS-sidelocks in 12 & 20 gauge which measure conventionally, go figure.
Karl

Last edited by Karl Graebner; 09/05/16 07:38 PM.