Okay I think I see what you are referring to. Yes, if the intention is to dial the elevation turret when shooting at varying ranges, it is preferable to index off of the turret cap (or some other external feature of the scope). In so doing, one can be reasonably assured the reticle will travel perfectly up and down.The top turret is the index point and even if the reticle is off, the gun will fire true if a level is placed in relation with the receiver's horizontal plane.
Whereas when using the reticle for aiming (i.e. using mildots), it is better to index the reticle to the bore.
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