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I don't think so; they fit 45 Colt / 454 Casull / 460 S&W chambers correctly. The 444 Marlin has a slight taper in original form, it's based on a rimmed 30-06 case with no bottleneck.

I use 444 Marlin brass in my 460 in a similar manner to the OP, but with old RCBS 45 Auto shotshell dies to crimp the over-shot wad in place. I make those wads much like the OP as well, but from card stock from primer boxes. I've found patterns are better when using a shortened 410 shot cup instead of an over-powder wad, at least in my guns.

I've posted these pics before but they seem appropriate here. The cases are "over-annealed" to fight case neck cracking because of the large degree of forming by the shotshell dies. The target was shot at 10 yards from a 6" 460 revolver, with an outline of my hand for reference.