I purchased 100 rounds of brand new Hornady brass (6mm CM) the other day and weighed it out just for the sake of curiosity. The range of weight was +/- 5 grains. I then sorted out 50 pieces of brass with a range of +/- 1 grain. The remaining brass I call the "variable weight" lot, ranging from 2-5 grains difference. I'm going to load 10 rounds with the +/- 1 grain brass and 10 random rounds of the "variable weight" brass. I expect that the spread of the variable weight brass will be greater than the +/- 1 grain due to difference in case capacity and pressure. I've heard stories and read numerous articles about the importance of weighing brass for accuracy but I have never seen anyone actually test the concept. To make it easier to see variation (spread size) I'm going to shoot at 500 yards. I imagine that there is a youtube video floating around out there somewhere but I'm wondering if any of you have done this? I'm always looking for an excuse to burn powder.