Hello Mike,

Just a thought...are you worrying unnecessarily about the Dampa and the problem is elsewhere?

In no particular order, could your scope, local weather conditions,
rifle set up etc be the cause?

I had a .20 Eliminator/Weaver V16 (890fps/Premiers) until last year. Very smoothe/accurate and no POI shift.

Once zeroed, I don't think I touched the scope turrets again.

HTH, Regards, Ed