I sort by manufacturer, then by weight. except for pistol which I load any servicable brass together since it is just practice ammo and precision accuracy is not a consideration. I no longer pick up rifle brass other than my own because I do not know it's history so I prefer to purchase new brass for my 243 and 270. For 223 I have lots of once fired LC 5.56 which I convert to 223 by trimming and removing the primer crimp. It has worked very well for me. Of course 223 seems to be pretty forgiving about brass.
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