Actually, a lot of guys shoot .44 mags through their .444's. The .444 has the same dimensions, just longer. I load one in the mag and one in the pipe. It won't feed more than one out of the mag. That is why I wanted some reduced load data. Thanks for the info on the Marlin forum. Flinch
No, they are not the same dimension. The Marlin round in .012" larger in diameter at the web of the cartridge. You could have a case rupture. Not something you really want to happen.
They shoot the same diameter bullet, but that's about it for commonality.
The Lyman manual is a good source of reduced loads for the .444 Marlin and Cast bullets.
I used one for a few years with a case load of IMR4198 and a 240 grain Jacketed bullet. Very good, hard-hitting round for deer, and with the right bullets, just about anything that walks this continent.
