Vol423,
The 380 CF is the 38 Long Colt, it originally was loaded with an outside lubricated ( .375-379") bullet. It was later loaded with an inside lubricated hollow base bullet( hoping the base would expand to fit the barrel) of about .357-.360" diameter. The similar 360 CF was loaded with an inside lubricated bullet, that fit the barrel, without the hollow base. If your rifle has a .375-.379" groove diameter, it is likely the 380CF/38 Long Colt. If it has .357-.360" groove diameter, it is the .360. My cousin has a 380 Martini, but the 148 gr hollow base bullet, won't stabilize in it. I had a bullet mold for .36 Navy conical bullet that had a short rebate on the base, and was lighter than the 380 bullet. We cast a quantity of these bullets, lubed them by rolling in alox, and loaded them in shortened 38 S&W special cases, using an appropriate load of Unique. They shot well, but required careful handling due to the short bullet base and they were a little messy. I think a better remedy would be to order a mold blocks for a bullet similar to one of the old Lyman 38 Colt bullet numbers. It sounds like a fun project, to me.
Mike