I will meet up with Tamid next week and measure the barrels and bores when I'm back in Calgary. Then we will really know where the Lang stands.

Regarding the chokes, I would first pattern the gun and then shoot it a bunch before I worried about adding any choke. My experience is that no choke can be plenty enough for the ranges most of us shoot at. As Dig has stated before, the Victorians killed a lot of game before there was such a thing as choke. That was without modern shotcups as well...