I bought 500 Starline 38 Specials not long before the most recent drought took hold. I had several lots of varying make, all of it VERY LONG IN THE TOOTH. I scrapped most of that old stuff, and retained these 500 new pieces with about 250 of fairly recent W-W unplated brass.
I don't shoot 38 Special brass in 357 Magnum revolvers. The 38 Special stuff goes in 38 Special war toys--Colt OMT x 6", S&W M&P x 5". and S&W 642 x 2". I have a lot more 357 cases, c. 1500 count. Those get loaded in a number of intensities, from #358429 @ 900 FPS to top-end stuff for the Ruger BisHawk. 750 38 Special cases is just about right.