Range Report Angle cosine indicator question

[Unknown]

I wasn't sure if this should be under scopes, observation devices, or here...obviously, I thought this was the best place, so here goes.

As the barrel is not parallel with a scope because the scope is mounted in a 20 MOA base, will that base throw off an angle cosine indicator enough to be significant? Or, because the ACI is mounted onto the same base, does that negate any variance?

If there needs to be a great distance to the target before there is any significant elevation variance caused because the scope and barrel are not parallel, then my skill level may be a greater factor anything caused by lack of parallel mounting.

Thanks in advance.

 

[MAGUA]

You can zero the ACI by making sure the bore is level then loosen the screw on the ACI and set it to zero then retighten screw.

 

[roggom]

The amount of correction if negligible, even then you can adjust the level of the ACI (screw on the side). A 20 moa base is something like .33333 of 1 degree of cant, works out to .000007 shift.

 

[Unknown]

OK, that all makes sense. Thank you. Level the bore, then level the ACI. Then there is no 20 MOA tilt in the ACI to deal with.

 

[damoncali]

The resolution/accuracy of the indicator is not high enough for the angle difference to matter. You'd need quite a setup to accurately measure firing angles to the minute. But conceptually, yes, zero it to the scope, not the bore.