Hammer1. These are for Perazzi only and assume you will add or remove a 2mm spacer under the comb for each notch the rib is adjusted.
It also does not take barrel length into account. The notches (with spacers) on my 35" Perazzi barrel give 4" POI changes at 40 yards foe each notch. 1/3 of that amount is because I adjusted the rib. The remaining 2/3 is because of the corresponding comb adjustment.