.444 Marlin is not just a lengthened .44 Magnum. It is, like other apparently straight rifle cases, a bit tapered.

I would not let preconceived notions about case life affect my choice of caliber. I pick the caliber for the job it is to do when shooting and make the reloading process serve that aim.

If you are going to shoot a lever action, automatic, pump, straight pull, or anything else but a bolt action or strong single shot, best figure on full length sizing.
The brass will last a lot longer than you seem to think.
And the cost of rifle carbide dies will cover a lot of replacement brass.