Rifle Scopes : 5x25x50 Zeiss HD5 sighting in oddities - need help

I don't know the reticle but I always verify everything at 100 yards.  If drop from zero should be "X" mils, check that at 100 yards - or meters.  As Reagan said, "Trust, but verify."

I have yet to use a calibrated reticle that was dead on at more than about 2 points of aim.

My recommendation is you scrap the program, load up 20-30 rounds and go to the range and get actual drop with your rounds, your gun, your ammo, your environmental conditions, then all will be right as rain.

Good luck.