Suprisingly, these numbers match on two seperate guns. Those numbers came from a Trubor I had. 5 inch with no popple holes. Currently, I am shooting a CK Arms Blackout, 5 in barrel, 3 popple holes and I think a CCG comp, 4 vents. The PF was pretty much the same. Here are some chrono results from my CK open gun using 8.1 and 8.3 grs. this was shot in south Florida and the outside temp was about 83 degrees.
CK Arms 9MM Blackout Chronograph.pdf