Weigh and select a few average weight cases to represent each lot. Then find a couple, one from each lot, that are the same length. Check the water overflow capacity. This means plugging the primer pockets (decapped spent primers seated backwards is one method), weigh them dry, then fill with water level with the mouth (no meniscus) and weighing them again. Figure about 0.1 grains of powder difference for each .19 grains of difference in the water weight they hold. You can adjust loads for them that way. It would, however, be reasonable to try shooting both adjusted and un-adjusted test rounds to see if you can tell any difference on paper or not.
