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According to my bullet app on my iPhone. You should sight in for -0.3 at 50 yrds and that will put you 1.5 at 100yrds and 0 at 200yrds. I got the calculation using 95gr Winchester xp3 ammo. So depending on the bullet you are using it should be very close.
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Velocity will vary from rifle to rifle,so you would need the actual muzzle velocity in a specific rifle.As well you need the height of the crosshairs above the center line of the bore, which also varies. If you really want a 250 yard zero,then sight in at 250 yards.