...I really like .20 cal but there's a shrinking number of pellets so be aware and stock up if you get a 20...
As my favorite Beeman pellets became hard to acquire for my R1/.20, ended up w/ the 13.73 gr. JSB Diabolo Exact .20 Cal.
Precise and hard-hitting, about all I shoot now.
Maybe 3K squirreled away.
They clock ~ 750 fps out of my R1 Carbine.
Also have as many 14.30 gr. Benjamin .20 Cal cylindricals, bought dirt cheap on liquidation.
Found the Benjamin's need a little swaging to shoot well in the R1.
GR