With a M-Rod 20" 22 caliber barrel installed, stock hammer spring and x-fer port, was able to get her right at 20 fpe.
Hard to believe, but I didn't have a Disco hs on hand, so I stretched the stock hs, drilled our the x-fer port to 7/64, filled to approximatley 2900 psi, got these numbers -
Crosman 14.3 hp from the tin -
24 shots/3 mags
hi 869
low 840
avg 855
es 29
sd 10
Was intent on doing a bottle mod to this gun, but as it stands, the reg point would need to be above 2k for the sweet spot, as the gun still had 2000 psi in her after 24 shots.
That string could hopefully be improved upon, and that is pretty decent power for a early season tree rat popper, so may have to think this one over a bit...
Anyone making power valves for the P-Rod?