Re: need advice on load work up for 338
I'm not saying that you can't use the chrono. All I was trying to say is don't get too stuck on your ES. if you want to use the chrono while you are testing then by all means use. Just don't get to stuck on what the numbers are saying on there. If you get a load that shoots really well at 600 but the ES is a bit high, don't discount that load just because the chrono says something that you don't like.
Since you are shooting 10 shots per load, you might want to stretch this test out a few days. It will take a long time to shoot ten shots per load while allowing your barrel to cool off properly.
Good luck and keep us posted!
Post your results so others on here can see. There are a lot of guys on here with far more experience than me.