I like to count cases out 100 at a time to anticipate when I'm nearing the end of a primer batch, so I generally count out 100 cases. It also serves as another way to tell when I'm nearing the end of the primer tube (the follower can stick). Sometimes I just want to set aside a couple hundred of such and such case. Other times I want to verify that the order of OF brass is indeed what I paid for. Counting brass gets tedious. So.... I got a Lee colator and a set of tubes. "Calibrated" them to know how many cases fit in a tube. In the case of 45GAP and 9mm, you can get 24 cases in a tube. I throw brass into the top of the funnel, give a quick shake and the tubes fill up. Only takes a few seconds. Add 4 more, lift the tubes and I've got 100 cases in the bag. Quick and easy and it's a Lee product that works well. I'm working on a stand that will let me pick them one case at a time for feeding into the 550 or a single stage.