Can you really shoot out to 75 yards?
I used to practice pistol for league shooting at 50 yards and thought I was ready to go deer hunting with my .45 Blackhawk. I learned a lot.
Shooting in the field (forest and rough) is very different from shooting at the range.
I took second place at my club, back in the day, at the NRA bullseye Wed night league. That's a much better than average pistol shot.
I learned that all sorts of crazy things happen out in the wilds. I'd say 98% of my deer were shot at less than 30 yards. I also shot a lot of twigs, tree branches and saplings. I have more than a few tales of "How the heck could I have missed? It's only 50 paces!" Well, nothing gets you humble like buck fever.
I tried the Contender with shooting sticks, set on a hill side and ... er... that's not where the deer are. And if you're using shooting sticks, may as well use a rifle, once you've bagged a few.
A good stout load under a Hornady XTP will punch a big hole in lungs/heart area. This is no time for Cowboy loads. Respect the animal. They are tough critters and you'll feel rotten for a year if you wound one and it runs off. More than a year, if you've got heart.
I didn't have good luck with cast bullets. We're in a CWD area and shooting in the neck isn't recommended. The XTPs worked well, though.
ps. No one ever asked if .44 Magnum was enough.
It's enough for anything in North America!