My friend and I shot some 357 magnum reloads across
the chronograph today. The load is 8.9 grains of Longshot,
a cci magnum small pistol primer and Sierra 125 jhp.
The revolvers are a 4" 686 and a 6" model 19.
What is perplexing is that the 686 produced velocities
that were about 100 fps higher than the model 19.
We even tried a 6" gp100 and the 686 produced higher
velocity than the gp100. I fully expected the 6" barrel to
produce higher velocity readings.
Is this a function of a defective chronograph? I have not
had it for very long. I shot a handful of 44 special loaded
with standard cci lp primer and 7.5 grains of Unique under
a 240 lswc and got readings of around 975 fps.
Any input is appreciated.