Without knowing all the details, I believe you should start with the sorting of headstamps, that in itself will give you a more consistent COAL, once you eliminate that variable you will see a rather dramatic difference and then you should be able to start to determine other variables that can be an issue such as dies, press, automation etc…. It was a world of difference since I have been sorting and further case prepping before actually reloading, yes it is more time invested but I can assure you it will minimize or pretty much eliminate the problem you are having as it did for me…