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Fabs:
If you look at a ballistic chart for any rifle/load you'll find that to be exactly the case. The expected impact point for your sighted-in range will be 0". At ranges shorter to that, the expected impact point will be lower. At longer ranges it will increase to a certain max. Then decrease again through a second "zero" and drop rapidly.
A really important consideration in setting your "zero" point is the effect it has on your "point-blank" range. Porbably not a really big consideration for a .22LR like the 10/22, but if you are using a laaarger calibler rifle for deer or other large game hunting.
H.
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TANSTAFL
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