Here's the target I've always seen used for 7.62x39 (it's been around forever, you can find them preprinted on Amazon I believe). The elevation lines, when printed on an 8.5"x11" standard sheet of paper are ~.35" apart, so it looks like 1/4 turn @ 25 meters gives you about 0.70" of travel if it's to be believed.
Not sure about 100 meters, as I suspect it depends on where you zeroed your rifle.
Assuming you are zeroing at 100m, I'd expect maybe ~2.8" per quarter turn based on the 0.70" @ 25m. That's a huge WAG though.
I always get wound around the axle when contemplating which way to move the front sight to get my POI in line with my POA. Usually I just try one direction, then correct it twice as much the other way when I realize I went the wrong way!
Ask Blicero, there's always lots of trial and error and general awkwardness when it comes to me actually firing
one of my SKSs (and trying to hit what I aim at). I'm not ashamed to say that I'm much of a shot.
Your postings give me inspiration though!