In order to duplicate the same POA and POI with the same pellet, and after a period of -- say -- a week or so between shoots, I run a .17 cal. Bore Snake once through my airguns. Then I shoot 10 to 15 conditioning shots, before trying my luck on paper or clay targets from 10m to 80m! If I don't run a Bore Snake and condition the bore beforehand shots go all over the place.
Now, if I shoot daily, then tha procedure is not necessary.
However, if I switch pellets, then I go through the Bore Snake thingy/10-15 shots routine all over again, so as not to give myself the blues
Cheers,
Nikos