Like many, I used to keep track but lost count at some point and don't really see a need to track it. Also like others, I over flared , (still) over crimped and load on the heavy side. I shoot more 357 mag than all other cartridges combined and I'm loading some cases that have probably been loaded 20+ times. Every now and then I'll grab 500 cases from once fired brass (online retailer) and I'll toss them in the mix, last order I got a few months ago was 95% starline cases - which was great. I do separate my weird off brand cases for lighter loading and if I'm going to put together some hot loads I'll hand select 100 or so cases that look best, are they actually better? Who knows. I haven't split many 357 cases, maybe 2 or 3 out of 1000 , I can live with that. As opposed to 454 casull cases (primarily starline cases) that split before they hit 10 loadings - some split on their first loading - with federal cases that have taken that same load 10+ times with no signs of failure. Brand of brass does matter for longevity.