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Before I get all giddy

Because the barrel and scope are inline vertically with no horizontal offset the projectile will track with a constant angle left/right. So if you zero for left/right POI it will be on target for all ranges.

It isn't so simple if you try to hold for the offset, instead of zeroing, because the angle between the scope and projectile path will cause the offset to change with range. 

So if you want to switch back and forth learn the required amount of clicks to zero.