Under 40-45ft won't tell you squat. Get out to a game...tune in your hopup with 0.25g (min)...preferably heavier (i.e. 0.28/0.30g) BBs. You can still chrony with 0.20g BBs...but the heavier ones will result in better accuracy at pretty much any range/distance.
If you tweak your hopup for 0.20g BBs...you'll likely need to re-do it for different weights/brands (definitely for different weights).
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