I was told by one of the tech support fellows at Starline that "the boss man" gleans tidbits of tech-intel from various firearm blogs and websites, that he read this thread, and afterwards (about a year ago) revised their specs for ordinary .38 Special brass.
If you need thick-walled .38 Special brass to maintain adequate bullet pull with .357" diameter J-words, then you should buy the +P headstamped .38 Special brass for assembling your "barrel polluter" loads.