Re: Newbie to reloading - Size new brass?
You would not believe how much controversy the question of sizing new brass has engendered on various shooting forums. Generally, there is a LARGE contingent that believes failure to size and trim new brass is sloppy and akin to walking around town with your zipper down.
I have never in many years of reloading, with only one exception, resized or trimmed new brass. The one exception was in a heavy recoiling revolver where new brass had to be resized, trimmed and crimped to keep the bullets from walking out under recoil.
I do inspect new brass as I'm priming it and reloading it. Rarely, you'll find a way off center flash hole or a case with a mouth so deformed that it has to be resized prior to loading. In short, there is no advantage in doing anything but inspecting new brass prior to loading it. Resizing and/or trimming it gives no advantage in accuracy or dependability.