IIRC The Henry rerpeater came with sights calibrated out to 400m, but the usable range was more like 150m. The 45-70 was a different proposal, with a full sized round, and a stronger casing. The 44Henry was a .44 cal bullet over a 28gr charge, with a rimfire ignition system. The main advantage was light recoil and usable in a short stroke repeater(Lever Gun). The 1866 "Yellow Boy" Winchester shared the same round, but the later models were chambered for the more robust .44-40. The 45-70 was designed with the long range shooter in mind, also worked well on both sides of the law. Buffalo hgunters liked to kill sveral and then collect the flints(Hides) from a single location rather then chasing a spooked herd. The round was usually hand reloaded on site, by the hunter, and they rolled their most accurate rounds as a miss didnt pay any bills.