Argo44: absolutely not, KM0 isnt an advertisement like specialty of the region, or other.

Raimey: Cogne steels are made in Italy. Cogne was - and is - a most respected Italian steel manufacturer, and barrels made with Cogne steels are higly esteemed in Italy. The Vincenzo Bernardelli factory, one of the oldest and most respected Italian gunmakers, was one of the main users of Cogne products. KM0 is indeed one of the many Cogne CrMo steels (KM0 has C = 0,31, Cr = 0,95, Mo = 0,20), but I emphasize again that Im not at all sure that KM0 stands for CrMo, as many others Cogne CrMo steels use different acronyms.