From an older post of mine, I still carry this load daily:
"I posted this elsewhere in this forum, my previous test results:
Federal 38spl + P HST Micro
Well I had a chance to chronograph this ammo. At about a buck a round, I only shot five through each of three guns. Not truly scientific with such a small sample, but it appears to be right on for factory claims regarding consistency of velocity, but in my 2" & 3" guns the velocity is well below the factory published number of 890 fps. I do not see on Federals website what barrel length or type they are using for their numbers.
2" S&W M337:
High 800 fps
Low 799 fps
Yes, a total for five shots of 1 fps variance.
3" Custom Colt Agent:
High 859 fps
Low 855 fps
Extreme spread of 4 fps.
4" S&W M67:
High 889 fps
Low 885 fps
Extreme spread of 4 fps.
Just for a control group, I then fired five Federal 148gr HBWC Gold Metal Match through the M67 for an average velocity of 753 fps and an extreme spread of 26 fps and a standard deviation of 10 fps. This M67 will shoot into 3.5" at 50 yards with the FGMM ammo off of sandbags.
Ammo lot # R12P1394144 Federal Premium P38HST1S 130gr HSP JHP 130gr "