Originally Posted by kermodie
Good read, however there is a misprint in the live fire method.
"If the second group falls to the left or right of center, the scope should be rotated clockwise or counter clockwise respectively" - should read, if the second group falls to the left or right of center the scope should be rotated (counter clockwise or clockwise) repectively. The upper reticle line should be rotated toward the deviation, same effect as the shoot one hole and adjust the reticle to the hole method of alignment.
It would not surprise me to have gotten this wrong, because these discussions are often counter-intuitove. Tonight I worked through this problem two different ways and got the same result. I believe the article is correct as written.
Take Fig 2.B in the article, for example. Bullet impacts fall to the right of the plumb line. This aiming error can be corrected - for this elevation setting only - by moving the aim point to the right by the same offset.
Which way do you rotate the scope to correct the aiming error for all elevation settings? Recall that 24 MOA of elevation adjustment have been added to the reticle to get the bullets to land so high on the target. The aim point is still down at the lower impact point (bottom of the figure). The rifle bore and the scope tube rotation axis are both pointed up at the second impact point (top of the figure). Therefore, rotating the scope counter-clockwise in the rings will swing the aim point to the right, because the aim point is below the axis of rotation. And that's what the article says you should do.