I have looked for data on the influence of barrel length on velocity/energy.
Having not found anything to my taste, I created a chart from Glock data. Since it is from Austria, the units are metric.
Velocity in meters/second.
Energy in joules.
However the barrel length is in inches.
If you need to convert:
- velocity: meter/second x 3.32 = feet/second
- energy: joules x 0.738 = foot.pound
The dotted line is a linear extrapolation - constant pressure - not true but not very false :smoke23:.
One interesting fact I found was that by putting the G-19 barrel in my G-26 (9mm) the energy level is 5% higher than a G-27 (.40) and the muzzle velocity 23% higher (lighter bullet).
Both are way over the G-30 (.45 ACP - 3 3/4" barrel); of course, te ratio of barrel length to bore diameter, with short barrels penalize the larger bore heavily.
Just numbers; I don't want to start another "caliber war" :wink:
Extrapolating to revolvers, bear in mind that the barrel length of a revolver does not include the cylinder, so a 2" snubby compares to a 3.5" pistol. OTOH the cylinder gap takes its toll ...
Click on the thumbnail to see the graph.
If you know of similar data, please let me know.