Hi. It was discontinued around 1950. Definitely a reloading thing only. You'll likely have to make the brass. Uses a regular .257" bullet. You can use .25-35 Win load data(the .25 is just a rimless .25-35 Win). Hodgdon has .25-35 data on their site.
However, Old Western Scrounger lists loaded ammo at $34.95 per 20. Made by necking down .30 Remington brass(Epp's lists .30 Rem brass, but you'll need a .25 Rem forming die.). Epp's is their Canadian distributor, so try them. It won't be cheap.
Dies will be a special order thing. Uses a #19 RCBS shell holder.



























