Don’t see the need for 38 special brass. 4-5.5 grains Unique in a 357 mag case yields 38 special velocity with a 158.
It's about supply and price. In cowboy action shooting, .38 spec is a popular case in .357 revolvers.
Unique is clean if you burn it hot, dirty in low powered loads. Lots of CAS shooters like Clays. Am. Select is another good one and pretty clean.
I tested of a number of CAS powders, shooting low powered loads. Cleanest was Solo 1000. Clays was almost as clean. Tite Group has more flash but is clean.
As posted before, with light loads that don't fill the case, you gotta be careful not to double charge. Lot of choices, lot of good advice on this thread.
Check out cast bullets for CAS. Those guys know a lot about plinking type loads for .38 spec.
DF
