My Lyman casts a 0.380. 335 gr.
Accurate moulds in the U.S. will custom make a mould.They Will ship to Canada. Excellent moulds. My last double cavity aluminum for my snider cost 178 shipping included. Sells iron, brass and aluminum moulds. Made to the specifications you give him. About two weeks to get it. They are as good as NOE moulds.
Buffalo Arms has them. I used to shoot a bullet of that diameter out of a .38-56. They will also change dimensions on any of their molds for a few extra $$$
Chris.
I have a Gas check mold by Accurate molds in .381”