The Lee 358-150-1R in .38 Long Colt brass. Crimped in the groove it is smooth and fast loading. Because the boolit loads so deep, it is only a few thousandths longer than the typical Short Colt gamer load with 158 grain RN that load much farther out of the brass.
Spend the money on TK Custom moon clips. They really are that much better.
This is the Lee boolit in .38 Special brass before I moved to the Long Colt. Note how deep the boolit seats and how smooth the cartridge is with the roll crimp.