Interesting. Thank you.

I wonder if there's another equalizing formula that can be worked out for small vs big bores - I remember once reading a discussion between two chaps that argued whether a small-bore barrel is proportionally stronger or not to the big bore barrel of the same weight - something having to do with the area and the thickness increasing to different proportions with increase in barrel diameter. But for the life of me I can't remember any details frown

Russian Hunting Shotguns