sentences:  As a commercially manufactured item this cartridge has been obsolete for some years, because of the inappropriate bullets often used in it originally, as well as problems associated with the Ross rifle that it was normally chambered in.Handloaders continue to load successfully for it, by removing the belt from 7mm Remington Magnum or .300 Holland & Holland before resizing or by using swaged and necked-down .300 Remington Ultra Magnum cases.Proper head stamped brass is also available from Roberson Cartridge Company.