I did this yesterday, 10 rounds per gun, temp outside was 47 degrees.   G43 averaged 915 fps, the 26 and 19 averaged 938-956 fps and the 34 averaged 994 fps.  The fastest round was from the 34 and was 1009 fps.  Your mileage may vary, i dont know how slow an hst will still expand but there isnt a huge difference in velocity however there is a difference.  At 25 yards it probably matters more, at 50 yards would any reliably expand?  I dont know.  This info came from a $100 caldwell chrono.  I rounded off some of the calculations but the above numbers were not rounded up if they were rounded off.  My glock 19C tends to shoot velocities more similar to the 26 instead of a standard 19 but i didnt test it yesterday.  I have 124 +p ill test today and post those numbers.  I assume the spreads will be greater

Thank you for posting the data. I carry the HST 147 in my G43. Mostly the +P for the extra 25-35FPS.

As an unrelated side note, about 5-6 years ago, it seems Federal lowered the velocity of this and the +P loads by about 25-50FPS. The older standard 147 load was getting 1000FPS from the G19 while the +P would get the full 1050. But that has changed. The bullet still expands wonderfully and probably will down to about 800.

Measured with LabRadar, my most recent lot of 147gr HST (2017 Production) was 983fps@70F indoors, 20rd average from two Gen 5 G19s.

My Gen 3 G19 is normally about 15-20 fps slower. The two Gen 5 G19s were statistically the same.

Also, the published G1 BC is 0.2, but I found it to average 0.132 in my testing from 0-50yds. 927fps @ 50yds with 6000ft DA (917fps @ 50yds with 0ft DA)

Other results:
MP Shield - 926fps
Storm Lake 4.95" - 996fps

Thank you for posting this

I carry 147 gr critical defense in my 43