Originally Posted by
revchuck38
I managed to glom onto some of the ammo I wasn't able to find last time and run it through the CZ. Again, data are presented as average velocity/standard deviation:
S&B 124 grain: 1121/7
Speer Lawman 124 grain: 1080/9
I just picked up a full-size Beretta PX4, my first new gun in ten years, and ran all the ammo I had over it to see the difference between its 4" barrel and the 4.7" barrel of the CZ. My chronograph may be dying; strings with an asterix indicate a weird velocity in there, 50-100 fps below the others with no difference in felt recoil or report. That yielded lower average velocity and much larger SD.
HST 124 grain +P: 1141/42*
Speer Lawman 124 grain: 1048/10
S&B 124 grain: 1096/2
Fiocchi 115 grain: 1133/17
MEN 124 grain NATO spec: 1118/7
American Eagle 124 grain: 1013/27*
PMC 124 grain: 1014/11
Independence 124 grain: 1050/31*
Winchester 124 grain NATO spec: 1132/6
So, there's about a 25-40 fps loss in the shorter barrel, or about what one would expect. If I were to shoot the PX4 in a match where it had to make power factor, I'd avoid the AE and PMC in this gun, though they'd be fine in the CZ.