I also chronographed a Buffalo Bullet Co. 125 grain conical over 18 grains of 3F Swiss out of one of my Secon Generation Pocket Navies at 880 FPS. That's pretty good out of a 5.5" barrel. I'd guess that Pyro P would be about the same as that. many years I used that because Real BP was harder to get.dicky, the regs have run real bp out of the state. i have several lbs of olde but i hold that in reserve [unlimited self life] and shoot pyrodex p.