I agree with virtually everything that's been said so far, particularly Mr Legg's comments on pitch being irrelevant to POI
within reason. Another issue that should be laid to rest is the 16yd thing. it's just not right( unless your eye is exactly 33.9" behind the bead). If you think about it the target/plate needs to be 16 X the distance from the bead as the bead is from the eye with the gun mounted. This will then give you the 16:1 ratio to allow 1" of impact adjustment to be achieved with 1/16TH of eye position adjustment.For a 6' person with a sxs using 30" bbls this means they need to be standing nearly 19 yds from the plate. With a semi auto it will be further yet.