[shibumi]

I think this chart will give you some idea.

The drop to zero at 200 yards is close to a foot.

At 500 yards it has dropped close to five feet. So at 800 yards he has to be aiming around 7 feet over the target to get to zero.

Note that this chart is made using the shorter M44, so the drop is probably slightly less with the 91-30.

[MHGinTN]

Extending my hypothetical example ... 'Or you can use a well designed chart which assumes the velocity for known loads and bullet weights.' ;^)

[expat1000]

Just add the two distances and drops together? That doesn’t seem right. Surely it would exponential, the drop at 4X the distance being much more than the 28 ft that method results in.