ES is only really important if you are shooting long range. Most of the cheaper chronos aren't accurate enough to for you to be able to get reliable ES data, average speed yes, but ES no.
One way to improve ES is to get consistent neck tension. Shawn Carlock mentioned that lubing the inside of the case neck with graphite improves ES. Get a container, put some lead shot in, put some graphite powder in, push the sized case down into the container, inside case neck lubed.
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