Trail Boss for $17 = a yes but you're only getting 9oz of powder.

Trail Boss is the only powder I use in 44spl where I'm dropping 4.0gr or more in my Lee Classic Turret Press with Lee Auto Disk Pro.

Dropping smaller amounts of TB in 38spl cases is not good with the Auto Disk.Very inconsistent powder drops and sometimes no powder dropped.

If you use a dipper TB may work OK but IMO Bulleseye is still the best powder for 38spl target loads,,,,,5.0gr of Unique for 38spl+P
YMMV

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