"..Universal is also not the greatest powder for .38 Spl, but it's not the worst..." quote per #15

Actually Universal is very close to Alliant's Unique powder if you
are loading medium to heavy 12 Ga. shotgun loads or pistol loads.

True you will need more powder, since it is a slower burning powder
but it will do well in medium loads or heavier, if needed.

Go shoot those loads , so you can come back and load, more................