Maybe a more productive discussion would be which factors matter the most often. From my experience, and others seen to concur, powder charge weight is usually consitent enough unless someone is using a thrower or scale that is really out of whack.
Going back to Denton saying 50% of the things people do for accuracy don't matter, and that you have to identify the big sources of error first - what factors are in the big 50%?
Concentricity? Seating depth?
