To figure out your best "point blank range" sight in (that is the term most people around here understand for this practice ) you need to think about the actual trajectory of the round you are sighting and the size of the target you want to hit.
My varmint rifles are sighted to be 1" high at 100 yards; big game rifles get 2 inches for deer sized game, 3 inches for things the size of moose. My old Win. 94 is sighted to be dead on at 100.
I don't want to have to do any calculating to keep the bullet from rising above the target at shorter distances.
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