I'd recommend you not have a dial made for an "average" ballistics for your rifle/cartridge. This will give you a false sense of ballistics. If you have the dial made for your rifle based on your 100yd zero at sea level, 60F, and your rifle velocity measured that day, then you go hunting at 5000ft altitude and -20F your dial's ballistics will not be accurate by a large amount for the same cartridge you zeroed. Also if you change your cartridge later to a different bullet, etc., again it will not match your ballistics correctly and you'll need to have a new dial made for the new cartridge. Instead have a MOA or MIL dial made and use a ballistics calculator.