Thanks for your replies. I was worried that I might damage the piston seal. My RX2 Beeman sounds like a .22rf and shoots dime size groups at 25 yards Daystate Howlers.
Just received my Uragan2 from Talon Tunes in .177 cal. One hole groups at 25 yards is the norm. Fx 10.3 shoot best. It also shoots jsb howlers very well. Extremely pleased with this rifle.