Thought of that, but 1mm = about .040" and no way the MWT in Categorie 1 steel would be .0787" just past the forcing cones and the end of the chamber in 12g, or .040" in Categorie 4.
8" 1.1mm = .043", 12".75mm = .030", 16" .60mm = .024"???

Last edited by Drew Hause; 07/08/13 07:53 PM.