Dialing for windage? Have you gone actually berserk, Rhys??
What, you mean like taking "The Rifleman's Formula"? (devised for shooting at other men with a 30-06), or the ready-reckoner from a page in your data book that you bought from Fultons, Bisley - then converting that formula to fit the exterior ballistics of a pellet gun?
I've tried that - and I can tell you it wasn't very successful.