This works for every scope, a no-fail method when shooting 6 ppc loads.
If you're sighted at 100 and go to 200, then center the reticle on the mothball and dial the scope to the bottom ring on the 200 yard target. A bullet drops that distance from 100 to 200 yards. So you're just dialing the scope from your hold point, to where the bullet would drop.
Same to go back from 200 to 100, hold on the bottom ring of the 100 yard target and dial to the center of the mothball.
This way if you use different scopes, it doesn't matter how many clicks, just move the reticle from the mothball to the outer ring, or vice versa. Works the same from 200 to 300 yards for 6 ppc.