 Winchester ammunition has kept the cartridge in production in the U.S.A.The 6.5×52mmR is a European cartridge that is a close variant of the .25-35 Winchester.It should not be considered identical to the .25-35 Winchester and is not treated as such by the Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (CIP), which has released separate specifications for each cartridge.