This video struck a nerve with me, make sure audio is enabled:
https://www.youtube.com/watch?v=3duhNVjAu6E
I bought a LEE Classic Loader in .45-70 after watching the video, even without owning a rifle in that caliber. I bargained on a lever action after som time though, but the caliber was .450 Marlin. So I made ammo using my Turret and normal dies. No sweat. The red box with the Loader kit kept bugging me though. LEE stopped making custom Loaders by the way.
So how different are these cartridges? Since this is a neck-sizer, the part of the cartridge that is sized is the same.
The difference is in the cartridge head dimensions:
I needed to ream the bottom of the die out from 12.84 mm to 13.51 mm for the 1st 6.40 mm of the die body. Since the rim of the .45-70 takes care of the 1st 1.78mm, only 4.62 mm is left. These are of course nominal numbers. I decided to ream it out to 14mm for the 1st 8mm of the body.
The sane option would be to go to a machine shop with a good size lathe and pay someone to grind the walls .4 mm thinner. I didn't do that. I've allways wanted a lathe, and contemplated buying one, but lack of space and funds made me try to do it with what I had on hand. I did buy a 14mm drill bit though.