This is really an excellent post; I love to see others' chronograph results to compare with my own.

The 5.4/Unique load with 158 SWC is a favorite load of mine. Also, you have demonstrated something a few of us have known for a good while: 2400 is a viable choice for top velocities in .38 Special, regardless of barrel length. Working at the upper end of the data and employing a heavy crimp optimizes it and keeps the unburned powder residue to a minimum.

Thanks for all the hard work; I've sat at a bench and squinted at numbers on that little screen enough to know that it can be a job, especially when the weather is hot.