Not in .38, but I collect range brass in all makes and calibers. I recently had a rash of split .45 ACP case mouths, so I examined each one with a magnifying glass. Lo and behold, every case found with a split was CBC, each picked up over several trips to the range (not from one box someone left). Trashed the whole lot of them, have tossed everyone I've picked up since.

I've yet to have any other brand case split on me with my mid-range loads, even after multiple reloadings. Won't use CBC again or buy it. I now use a magnifying glass to inspect every newly acquired case before my initial reloading. I've tossed one WW case because someone had stepped on it and made a tiny cut in the mouth edge. The rest all good to go.

Take that for what it's worth.