Ive killed a couple deer with my ruger GP100 6" barrel which is a 357 mag my furthest shot was about 50 yards give or take a few yards. The deer ran about 20 yards keeled over was a double lung shot with a complete pass through the ammo i was using then was American eagle 158 gr soft points. Now I use two screaming hand loads one pushes a 158 grain XTP/HP at 1546 fps, the other pushes a 180 grain XTP/HP at 1471 fps. With a carbine or rifle barrel 357 mag has a substantial velocity increase, factory ammo that shoots a 158 grain bulet at 1245 fps from a 6" pistol barrel, will increase to about 1450 to 1500 fps from a carbine barrel. I would say with that kind of velocity from a carbine in 357 mag you should be good for 100 yard or under shots on deer. 44 mag is a give in, from a carbine and in some cases from the right pistol they will easily make 100 yard kills on deer. 45 colt in carbine would also be an effective cartridge on deer to 100 yards. hope this helps