Greetings @ShortStuff,
Without knowing the projectile and velocity you are working with it is hard to give much advice but in my .308 with a 150 grain projectile chronographed at 2,750 fps I zero at 170 metres This works out to a little under 50mm high at 100 metres and the same low at 200 metres. I mostly work in metric after the building industry converted to it in the middle 1970's. It is important to actually zero at your chosen zero range as my rifle would be around 25mm high at 50 metres. My .308 M700 mostly gets used on the rifle range these days so I can dial for zero for both range and the load I am using at the time. .308 rifles tend to shoot different projectiles and loads to different places so it is important to zero with your hunting ammo.
Regards Grandpamac.
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