I bought my Lee Speed from on old Afrikaner /German family on a hunting trip to the Kalahari .It was sitting above their fireplace and the family had owned the rifle since around 1910 . Unfortunately the bore was totally gone; a 303 bullet would drop entirely through the barrel .I restored the rifle and rebored it to ,338 x,303 .JES reboring did the work and it is excellent. .Same headspace just with a 338 bore. Simple to reload just put a 338 expander ball in a 303 neck size die . I was using a 338 Federal die to seat the bullets which worked fine but recently had a tool and die maker make me a set of custom dies in 338 x 303 Nitro Express which I named the cartridge .I use 303 brass and 200-215 grain bullets .Just a thought if you have a shot out barrel. My project is listed in the Lee Speed forum