Nothing wrong with #2400 in the .38 Special. Newschoolers may not agree and if they have great experience with #2400, I would respect their educated opinions (based on extensive load development and testing) as valid ones.

I've tried many of the newer rifle and pistol powders that have been marketed in the last several decades. Usually, I'll revert to an older powder that provides better accuracy. Velocity is important to me but it's alway secondary to accuracy.

A few unburned powder particles is never a good reason to abandon a powder that provides top notch accuracy (and usually good velocity) except by today's fanatical fastidious shooters who have an aversion to anything remotely dirty.

Unless you are assembling low velocity target loads or using lightweight bullets the catridge wasn't really designed for, #2400 is always worth a try in the .38 Special.