Winchester White Box 240 JHP.
With my Marlin 1894 in 44 mag, the bullet profile and overall lenght are critical factors to proper cycling. I have been told to stay away from semi wadcutters as the shoulder tends to catch on the edge of the chamber. I have never shot anything but the Winchester white box ammo, with 240 grain jacketed hollow point. Which I believe is an XTP bullet and can't imagine any other bullet working better on deer. I have killed three Whitetail deer. Two shots were pass throughs behind the shoulder, the third bullet hit the neck and though destroyed the bullet was mostly intact. None of the deer required a follow up shot. Also Winchester White Box is probablly the least expensive ammo you will find at a store.