Rifle Scopes "Zero" Range

If you zero at 300 yards then you won't be holding under more than 1 MIL at closer distances, and your 400, 500, 600 will fall very close to the whole MIL marks on the lower portion of the reticle.
 
I personally find it easier to hold in one direction (hold over for everything, instead of under for some and under for others). So I always just use 100 yd and hold over.
 
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