We're trying to load up some .38 Special for the gun that my brother just bought. We're pretty comfortable reloading 9mm and .380, but we're not sure how to set the crimp for the .38 since we've never done that on the others. We were taught to not use the case mouth expander, do we need to be using that for the .38? We are trying to use 158gr BBRNFP, 3.2gr Tightgroup, 1.455 OAL. And we're reloading in a RCBS single stage press (JR3) with a RCBS die set. Any tips for getting the press setup correctly would be appreciated.