It isn't hard ammo to make, just buy some 7.5 Swiss brass, potentially trim the neck down (1889s seem to have more tolerance on the chambers for the longer brass, all the other early designs I have used needed the necks trimmed to 53.5), put a mild load in with a .308 bullet and away you go. I personally don't bother with the ammo pulling and reusing games, GP 11 isn't common enough to make that game worth while. Unfortunately there doesn't seem to be any current manufacture ammo which is suitable for the 1889 on the market.