Yes, that is one of the three-part series. Sorry to the OP, none of this answers your question about POI shift. I doubt that a little bit of creep on a properly tuned gun would affect horizontally or vertically for that matter. My unregulated BSA Buccaneer will see a shift diagonally about 3/8 of an inch between 230 bar and 140 bar at 30 yards and an ES of about 25 FPS. That is not much for such a wide range and I suspect that is caused by the expansion and contraction of the air tube pulling on the barrel band.
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