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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.   
 
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