I quit sorting cases when I got volunteered to accompany a renowned Bullseye Pistolsmith to the range for Ransom Rest testing on his new builds , reworks etc . All shot with same load 3.8grs Bullseye , H&G 68 SWC , WLP primers & mixed cases . Granted all were 45acp 1911's with light loads . Don't know how it'd work with smaller case/higher pressure cartridge . For jacketed & stiffer loads I'd segregate as it does make a difference . 9mm accuracy buffs will only shoot jacketed with new or 1X fired cases only . Seems smaller case & higher pressure it pays to be painstakingly exact as it does make a difference in groups , especially @ 50yds .