green01: if the earth had no atmosphere and had the same gravitational acceleration, a projectile would never hit the ground if it were fired horizontally (parallel to the ground) at 8,000 FPS. It would literally be like a satellite at 4'. (trees and mountains not included in this example!)

Slamfire: Must be a really odd scope/gun configuration....but I have hard time believing a bullet traveling 100 yards and hitting dead on in that distance when on the "up" of it's trajectory.

But this is an interesting problem.

I guess to figure out what was really going on, I'd go to a VERY FLAT PLACE where I could put transparencies out at like ever 25 yards to cover 200 yards or so. I'd color code them with like a 1" circle (not darkened), vice my gun, and through the scope work to line-up those circles in the transparencies.

They'd have to be just 8X11 pieces, but it would be important to make sure the aiming point was the same in each.