I am in the process of casting bullets for my Grandpa's 1894 /38-55.I have a Lee .379-250gr-RF mold with no provision for gas check.I was wondering about leading with this bullet as I should be able to drive it at 1600-1800fps as I have the long barrel version with nickle steel .Was thinking around 30gr/IMR 3031 for starters.I have several cast books.I would like to find a 375296 Lyman mold 280gr but this is the best I can do for now.I have a 375248 but it is .375 bore perhaps too small? Anyone load this cartridge with cast bullets?Thanx Harold