Didnt the man ask about the 44 Mag at 50 yards? Why are we muddying up the topic with everything else. He asked about the 44 and gave reasons why he wanted the info.
Firepower: I have a Model 29 6 inch Smith, I shoot cast 240 SWC pushed by 22 grns. They come out of my gun at 1328 fps. Thats 741 ft lbs at 50 yards, or 619 at 100 yards.
I mention the 100 yards because the state of wyoming requires at least 500 ft lbs of energy at 100 yards for big game hunting.
I figure if the biologist think the 44 is good for elk (which are a bit bigger then bandits) then it should suite your porpose at 50 yards.
I under stand your point, some times its just no practical to drag a rifle around. In you case I think your choice of a 44 mag would be satisfactory.