Re: Changing brass, keeping load?
Winchester brass is great brass, once you cull the few that have factory flaws. My rule is never ever change anything once you find a repeatable quality load unless you want to go back to the starting point.
I went through this dilemma about 6-7 years ago when I had a proven load in my 30.06. I found some Lapua brass on sale and bought it. Guess what? I never was able to reproduce my original load I developed with the Winchester brass.