When I'm working up a load I sort by headstamp, for consistency. For some "special" handloads I sort, like my 44 Magnum "T-Rex Killer" loads (265 gr RNFP over a max load of WC820). My other semi-autos get a glance at the headstamp and if I see an undesirable mfg. I can toss it, other wise no sorting. I haven't run across any revolver brass unsuitable for my uses so I rarely sort, but I do look at the case head and primer pocket during inspection, the first step after cleaning...