You will have to define what "accurate" means to you. I've made shots out to 100m and seen shots made at 300m
Which .50 cal, and do you mean .357 Magnum? If you're comparing the .50 AE to the .357 Magnum, the .50 AE is more powerful, by far.
There are too many factors that determine how far a bullet can travel to say with any accuracy how any one particular bullet will travel. For pistol bullets, most people say the average is about a mile.
You will have to define what "accurately" means.
Accuately, about 150 yards. How far can it travel with no accuracy? About a mile and a half.
roughly about 22 miles accurate
No one currently, though the M1 Carbine has the equivilant power of a .357 Magnum, and that's a semi-automatic. The .44 magnum is in an entirely different class than the .357 magnum or the .30 M1 Carbine rounds (not at all the same as the MI rife 30-06 round). I'd look for a used Ruger...preferring the "Deerstalker" style to the model 99/44 "Deerfield" carbines...because though the Deerfieds are newer, they simply are not made as well as the old Bill Ruger .44 carbines. I have had to trail far too many deer crippled by the .357 magnum, to have much respect for it as a hunting round. Deer hit with a stout .44 mangum round, do not usually go very far. I have gotten dozens of deer with the .44 magnum (pistol and Rifle), and it simply is a great performer on deer.
www.SniperCentral.com says that on a calm day, it can be acceptably accurate out to around 600 yards.
It's supposed to shoot 10.7 m but it's more accurate when you take the barrel off. (yes, it comes off)
About 400 meters in semi auto mode, 300 meters in full auto.
Depends on the ammunition. Rifled 12 gauge slugs are accurate to about 150 yards
It depends on how you want to define powerful. A 357 Magnum has higher muzzle energy, but a 45 just has the sheer diameter of the round going for it, so id say they perform about the same disabling human targets, but as far as actual "power" persay, the 357 is technically more powerful, but that doesnt make it a better man stopper.