The "CARCANO" Mod.91 rifle (not Cacarno) was adopted in Italy in the ww2 with the same 6,5mm caliber of the ww1. Previusly some rifle was tested with 7,35mm caliber (Mod.91/38) but, due the difficulty of sourcing of the new bullet, these rifles were sent to help the Finnland against URSS. Also the 8mm Mod.1888 Mauser was tested, but not adopted. In the 1941 eight rifles just were tested with 8mm RB Breda caliber. At the end of the war some rifles Mod.91/41, under request of german army, was made with unusual 7,92x57 JS caliber and hundred thousand of these was converted in 8mm Mauser caliber from the Heinrich Krieghoff of Vipiteno.