I don't have ready access to my magazine right now, and I read the article a while back so I'm writing this from memory.
I have a problem with the author's methodology. As you mentioned, he chose "the most accurate powder charge" of 45 grains of Varget with one of the constraints being no pressure problems in any of the component types. He's not going to get the best load right there. I assure you that in RP brass 46 grains will be more accurate than 45 grains with 165/168 grain bullets in most rifles you would care to test it in. A charge that is safe and "best" in thick Nosler or Federal brass isn't going to be the berries in thinner brass having more capacity like RP, or the even more capacious WW.
