Here's how it's supposed to work in general:
Originally Posted by MICHAEL CARLIN
If you don't use the beads, which many wingshooters do not, you may be able to change the shims to move your POI around. The drop shims can change drop, the cast shims can change cast.
I believe ZZ offers the least drop and C offers the most drop.
What many do, myself included, is to place large paper targets out at a reasonable range, say 25 yards, and just place a small dot in the middle of the large blank target. From a standing position, take a fairly quick snap shot at the small dot. Maybe do this 3-4 times w/o looking at your pattern closely. Long rolls of butcher paper are great for this.
This should give you an idea of where your gun patterns when you are shooting it.
If you want to change the POI, work with the shims accordingly.
mudhen - CA
"Lighten up Francis"