I have no chrony so I was going by various reload data, and have no credible data. Just guesswork from what I read with no consideration given to the short barrel length, to keep things on the safe side.
I did try five different FBI loads, one factory and four reloads:
Remington HTP 158gr LHP advertised at 890fps
231/4.3gr
HP-38/4.3gr
Unique/5.2gr
Power Pistol/5.5gr
Going by kick/recoil, the Unique/5.2gr load was definitely the warmest. The other four all felt about the same.
I did try five different FBI loads, one factory and four reloads:
Remington HTP 158gr LHP advertised at 890fps
231/4.3gr
HP-38/4.3gr
Unique/5.2gr
Power Pistol/5.5gr
Going by kick/recoil, the Unique/5.2gr load was definitely the warmest. The other four all felt about the same.