Had to seriously dig in the notebooks to find this but the chrony numbers I got when I tested it before tearing it apart to swipe the gas ram:
-Benji Dome 27.8gr: avg 540 fps, 18fpe
-H&N FTT 19.91gr: avg 621 fps, 17 fpe
-JSB 25.39gr: avg 560 fps, 17.68 fpe
-Polymag 26gr: avg 578 fps, 19.3 fpe
-H&N Crow Magnum 26.23gr: 561 fps, 18.3 fpe
-Hatsan Vortex 629 avg, 17.5 fpe
With a spring, the numbers should be within 10-12 of that. Your numbers may well vary a bit but should at least give you an idea.
Just seems that one in my picture if you tried to bend or straighten it it just crack or snap in 2 . Maybe some pot metal looking stuff. I dont know but that's the feeling i get from its material.. now the 25 sc pistol aint bad vs the rifle on feel and pull direction. Its more a stamped steel.
Again, not talking about the Quattro although I've read any number of stories from owners who have had those Quattro triggers snap at the front 2 screws. It's just whatever cheap metal Hatsan made them out of then drilled 2 big holes for the adjustment screws and then plated them.