Re: .338 Edge from 7mmRUM brass?
I have heard it said that if up sizing 2 calibers that the necks should be anealed after necking up.
I also agree that these should be sized in at least 2 stages. First 30 cal then 338.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.