Bad news for the 38 S&W - this cartridge takes a .360" bullet. You could probably reload with a .355 HP, but I think your accuracy expectation would be rather low. You might be able to find someone swaging a HP lead bullet, but even finding a correct cast bullet can be difficult. One place to look is
Nash Castings.
You definately should start reloading, especially since you like some cartridges that aren't popular enough for the factories.