I've noticed that when I add some of the larger slip-on recoil pads to my rifles that my point of aim seems to change.
Is this just me? or do others experience this?
I can zero my rifles with the pad on just fine. Slip the pad off and my shots are either two high or two low depending on the load.
Maybe i've just developed a weird flinch I am not aware of.
"very frustrating"

don't use any slip-ons, but when I shortened the stock of my 9.3x62 Sauer 200, the first three shots I got a little warning tap on the brow. By the third time, I KNEW something had changed and I adjusted my head position a bit. Never experienced any change in POI though. Nor can I see a physical reason for that, unless you somehow tilt the rifle when with or without the padding....

Frans

They say that the fixed sights on the early Mannlicher-Schoenauers (models 1903-1910) were regulated with a cleaning rod and two spare cartridges in the trapdoor butt. If you took them out the POI would change because of the weight/balance difference.