I like to use an appropriate tool on flash holes with new brass, especially something like 6.5-284 Lapua from which I expect great things. I never mess with primer pockets, at least not in the last 40 years. Did some of that as a beginning reloader. Seems to me like a waste of time, although for years, I've read stuff from the advocates. Just doesn't seem to make a difference. Would appreciate hearing from others on that one.