Since I'm not a "precision" shooter, just a hunter and casual target shooter, I sort cases first by head stamp; then by weight (after resizing, cleaning flash holes, and trimming to length). I then select the cases I want to reload based on how I sorted them out, attempting to load groups of cases that are the closest to the same weight by making "bandwidths of tolerance." 1) Cases that weigh the same; 2)cases that weigh within .3 grain of one another; 3)cases that weigh within .5 grain of each other. All the rest of them that are beyond the .5 grain bandwidth go into a "plinking case" box that I'll use when I want to cook up some loads just to get some trigger time or work with a new rifle/scope combination. It's not a very scientific approach, but it serves me well for my purposes.