I've only loaded 10 or 20 thousand .38 Short Colts, so take this with a grain of rice.
I load on a Dillon 750 with a bullet feeder and a case feeder.
I run a .357 sizing die, 9mm powder funnel, 9mm seating die and a 9mm crimping die.
I load mine to an OAL of 1.20 with a .358 160 grain bullet (Blue or Bayou).
I'm running a green conversion kit that I drilled out so a .38 Short Colt would fit thru it (it still works fine for 9mm).
Keep in mind any 9mm load data will work in .38 Short Colt.