Thank you for the comments on the article.. I'm glad the information has helped some of you!
Most shooters never see proper scope mounting. Often times gunsmiths/store clerks do a quick and dirty job of mounting your rifle scope. They do not give any thought to what they are doing with your expensive rifle/scope combination.
The scope bases need to be level with one another. One can use a precision straight edge to check this and machine/shim the bases until they are flat/level with one another. Receiver tolerances can be out quite aways...
Once this is done, mount the ring halves providing the maximum support for the scope tube ensuring proper eye relief. Use a lapp to lapp the ring halves to at least 75% contact with the lapp. I use a water soluable lapping compound that is available at most automotive stores, it cleans up easier. Once the rings are lapped and mounted/tighhten to 65 inch pounds, I use Mark 4 style rings, we then level the base in the vise.
I use a Starrett precision machinists level to level the scope base and hang a plumb bob across the shop to align the reticle. Tighten the ring caps evenly checking the reticle as we do so.
This gets us VERY close, we then use the method described in the article to fine tune the reticle. One reticle perpendicularity is achieved it is DONE. Gremlins do not reside in the scope making changes to the reticle while you sleep.
Yes, we see alot of shooters who cant the rifle. The easiest cure is to purchase a scope level and mount it on the scope tube ( do so when we are making the reticle plumb with the rifle in the vise) This is a great truth detector and will aid you in long range shooting. If Len okays it, I'll do an article as to the effect of reticle cant at long range.
Holland Tech Tip #409 When hunting in rough mountainous country it can be hard to determine if the reticle is plumb. Trees grow plumb most of the time and can be used to check reticle perpendicularity before making the shot.
Hopefully I've answered your concerns???
Thanks for the opportunity to share our knowledge.
Be safe and shoot straight!