Loaded up some 9's to chrono for power factor. With 3.6 of 231, 1.15 OAL, Win primers. Glock 34 gives 134 PF, Glock 17 drops to 132 PF, XD 5 inch gives 134 PF but then the STI Trojan 5 inch drops way down to 126 PF.
The STI .40 and Glock 35 are pretty close in PF so one would think the 9mm's would be comparable.
It was a little overcast so I'm thinking (read hoping) maybe there was a change in lighting. Has anyone run across this much variance before?
I'm going to load up some more and try again but the velocities were pretty consistent 856, 858, 868, 852, 866 FPS.
Thanks.