Re: need advice on load work up for 338
Why are you so worried about ES? The only time that I use a chrono is to find out my avg velocity for my shooter app. Even after doing that, I still go verify my drops so I guess I just use the chrono to get me close.
Just load up some in different grain increments and go shoot them at whatever distance that you want (depends on how far out you shoot in the future). If you are not going to shoot past 500 yds then you can test at 100 or 200 yds and be fine. If you are going to shoot to 1k or further then you might try testing at 300 to 500 yds and see how they do.
If you haven't shot longrange very much then you can start out testing at 100 and take the best three loads and then test them out further.
In the end, the target, not a chrono, is goingtotell you which load is better. Don't get too stuck on ES. I have a rifle that shoots a load with avg ES of around 20 and it holds half MOA all the way to 700 yards.