Hello from Georgia,
I have a .444 Marlin Lever gun and have come to like it very much. I have shot some factory loars as well as some handloads and it performs well with both. I would trust it on any deer species in North America as long as the shots were kept within 150 yards or so. Much past that and this round falls quickly. It is a solid, predictable and potent round ! Mine has taken 4 deer, all under 100 yards and none went more than 40 yards.
Dave