Quite a cartridge. Big enough for almost anything.
The 444 Marlin can push a 240 grain bullet at 2,350 ft/s generating 3,070 ft·lbf of energy. 150 yards and under it is a pretty powerful cartridge.
The 30-06 can push a 220 gr 2,400 ft/s 2,850 ft-lbf of energy.
However the 444 Marlin drops energy and trajectory almost twice as fast as the 30-06.
The 444 Marlin should be a great cartridge for anything under 150 yards on anything from Black Bear and Elk on down.
It would be a little over kill for rabbits.
Keith