Great, thank you. I'm going to chrono the Rem version to compare as well
Revolvers are notorious for varying in velocity from revolver to revolver, even in the same model revolver with identical barrel lengths.
Cylinder gap is a big variable along with chamber and throat dimensions, forcing cone dimension and bore dimensions.
If you are shooting the same ammo lots in the same revolver, you can draw some conclusions about relative performance in that revolver, but it won't necessarily be generalizable to other revolvers.
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There's also the issue of how the data is sampled and whether or not the results are statistically significant. For example, the velocities below may or may not reflect significant differences:
2" (M60) 805
3" (M337) 824
4" (M19) 876
5" (M27) 898
6" (M19) (967) Note; This M19 has a "fast" barrel.
It if the sample size is small (less than 10 at a bare minimum) the differences in the average velocities between most barrel lengths are suspect.
Even if the ammo tested had a fairly average standard deviation in velocity of 25 fps, that SD would mean the differences between the 2" and 3" results and the 4" and 5" results are not significant, even at the fairly low 67% threshold.
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The ballistics by the inch data you often see quoted in various threads fails this standard spectacularly, as they use 3 rounds fired over 2 chronographs in tandem to get 6 data points - which is really just 2 sets of measurements for the same three shots now confounded by differences in measurement error. And even 6 shots would not be any where near sufficient.
