All Swedish Mausers were chambered for the 6.5×55mm cartridge, and all Swedish-made actions were proof-tested with a single 6.5×55mm proof round developing approximately piezo pressure (55,000 CUP). Swedish Mausers were manufactured by Waffenfabrik Mauser AG in Oberndorf a/N in Germany and in Sweden by Carl Gustafs Stads Gevärsfaktori and Husqvarna Vapenfabriks Aktiebolag. All Swedish Mausers, whether built in Germany or Sweden, were fabricated using a Swedish-supplied high grade tool steel alloyed with nickel, copper, and vanadium, a product then noted for its strength and corrosion resistance.