For that amount of re-loading, you will be using some form of progressive press. As already mentioned, you don't weigh every round. Get things setup and dump a "check weight" onto the scale every (how ever many makes you happy, for me it's every twenty or thirty rounds ..) and see what the scale says. If it has wandered out a little, with loads I make and how I use them, it doesn't matter a great deal, it's close enough for me and what accuracy I am capable of. Now these are pistol loads I'm talking about, for any and all of my rifle loads, I use a single stage and do weigh every rounds powder charge.