I have a 1899h 303 savage, with a 25-35 switch barrel. I know the barrel has being with the gun since the 1930's when my great grandfather got the rifle, before then, not sure. My question, is this a factory pairing? It came up that the rotary magazine may not feed the 25-35 cartridge.... Any help would be great! thanks. Rifle has a 20 inch barrel, made in 1912.