Good luck! I’ve always loved that cartridge. Had an old marlin when I was a kid that shot the 220 Hornady into an inch at 100 yards with imr3031. I sold it when I was a broke college kid. Bought a different marlin 6-7 years ago but it doesn’t shoot anywhere near as well as my first one. It must be a cursed rifle as I’ve hunted it a dozen times or so and never pulled the trigger on a deer with it yet. Keep us all posted on your cast bullet results. Bullets and brass are tough to find for that old cartridge. I might have to start casting bullets for mine someday too.
Ben
Starline will sell you all the .375 Win or .38-55 brass you could want:
https://www.starlinebrass.com/375-winhttps://www.starlinebrass.com/38-55-brass-2080
