Ron I have the feeling you have the R1 in pieces by now . Hope I'm wrong but your shooting in the best conditions , 10 yards in your own basement. I still think it's the pellets.Chris
I'm not familiar with .20 gauge, but perhaps a heavier pellet?
Not saying this is the case with Ron's HW80, but the thing with the .20 cal that keeps me from getting one is: if your .177 or .22 cal springer turns out to be really pellet picky, you have literally more than a 100 options at hand to try. But if your .20 cal turns out choosy, you run out of pellets to try in a heartbeat.