All brass is not created equal. Some is thinner. I've had some 38 Spl. split after 1 or 2 mild reloadings, others will load 20 times. Some batches of brass just aren't up to snuff, manufacturers aren't really concerned with reloading life of their cases, at least that's my opinion. The cases that split early were Federal loaded ammo, purchased new, reloaded a couple times or less. Very unusual, as I've used their brass for several years without problems. So, even same brand isn't all the same. Lots are not all the same, nothing has changed on my end, guns or gear, FWIW.