Originally Posted by Walkingwolf

The unburned powder burns once outside the barrel, causing muzzle flash. You probably will not find much unburned powder in the cases. 2400 is a powder that performs at higher pressure, so low pressure would result in inadequate ignition. Doesn't sound like your case, I would suspect you are into +p territory, possibly 38/44.

I was unable for a while to get 2400, I switched to Longshot which is about the same burn rate. I only use it for +p, and 38/44 loads.

I see no reason not to carry 38/44 in a J frame, had a detective friend that carried factory 38/44 in his model 36 forty years back. He fired just a limited number to get his bearings. The rest of his qualifications were done with standard factory loads. At that time it was 158 grain lead round nose.

If it was my gun I would limit the amount of loads with a slow powder. I use tightgroup for most plinking, but carry 38/44 loads in my guns. Maybe you should consider blue dot, still a slow/moderate powder with a strong reputation.