Saw some discussion on calibers and barrel length, just wanted to mention
ballistics by the inch, where they compare velocity for specific factory loads in different barrel lengths for different calibers.
They also did some measurements testing effect of barrel gap. Just hadn't seen this site mentioned for a while and didn't want their work to be lost.
The price of J frames have gone up due to the recent panic, but otherwise J frames used to be in the 300's, somewhere like $350 or less. For a revolver with a solid reputation, price wise it used to be equivalent to more budget oriented semi-autos, like a used Ruger semi-auto, or maybe a new LCP.