Tables here
For perspective, read .45-70 at Two Miles: The Sandy Hook Tests of 1879
Not always was good shooting optics, computers and high power purpose built rifles. Sometimes, it was just good shooting.
Enjoy.
At first, we looked around to see what had happened. There was no sound of the rifle firing, only the smack as the bullet hit and splashes of sand at the point of impact.
As per our training, we began firing in the direction from which the bullets came. Then, someone saw a slight flash of movement on a far hillside. The range was far beyond the range of our M-16's, so we started firing with an M-60 machinegun. Nope, still out of range. So, in frustration and a little dose of competitiveness, we hauled out an M-2 .50 caliber machinegun. It took a while to get it set up, and in the meantime, the sniper was moving. We could see the slight flash of sun on his plastic rain poncho as he moved away, laterally across the face of the hill.
Bringing the .50 to bear, the gunner walked the rounds in on the figure as he scrambled to get out of the area.
Ultimately, we got him after multiple rounds from the .50.
When we went out to recover the body, we found he was armed with a World War II 7.92 mm German Mauser with no scope. The ladder sight on the rifle was set at 1900 meters (over 1.4 miles)
Although he didn't hit anyone that day, the distance from which he shot (and barely missed) was astounding. Good shooting for an old rifle with iron sights.