I just think that 2400 powder or slower is not a good chice for the 38 Special case.

In my J frame snub nose, Blue Dot gave me the highest fps with a lead 158gr bullet.
HS-6 had high fps but the recoil to me was a lot harder.
Unique also had high numbers plus a heavy recoil.

I agree whit the others to pick up some Trail Boss for light target use.
A starting load will fill the short 38 case almost 50% and a full
load will be close to the base of a seated bullet.
If you can find it.