OK, that makes sense. Based on Char-Gar's measurements from post #6, it looks like most commercial 38 Special brass runs .009" - .011". That makes a pretty good argument for your .010" Starline case wall thickness and a .357" pilot for the outside trimmer. Char-Gar reported he had LC brass that was running .014" but that military stuff seemed to be the exception.
I've learned more from reading these 42 posts than I have from some reloading manuals that I've practically memorized over the years.
Gentlemen, THANKS AGAIN.