I was wondering if anyone here noticed if their P22 changes the POI during a range session? I normally rotate among three guns during a typical range session, the P22 (40-50 rounds), a S&W M19 (20-30 rounds), and a Colt Series 80 (40 rounds), then back to the P22 for another 30-40 rounds. What I am noticing is that the P22 shoots dead on during the first session, but seems to shoot well to the right during the second session, by about 2-3" at 25 ft. Elevation appears to be unaffected. I have verfied this with mutliple sessions and have even shot off of a rest to verify the change in POI. I also do not shoot to the right with the other guns.
The only thing I can think of is that the sights are just slightly loose, enough so that the jarring from the first 40 rounds moves them enough to change POI. The only other possibility I have thought of is that the sights move while the P22 is lying on its side on the shooting bench.