Brass Prep for Precision Rifle

I sit here thinking about what to write about brass prep. I do this while sitting in my garage while my Giraud annealer runs my latest batch of brass. I’m getting ready for a ~ 3-400 round month of local and major PRS matches. I define brass prep as whatever I have to do to get new or fired cases ready to load (primer, powder, bullet seating). Why do we care about brass prep, SD, concentricity, powder measurements to the kernel? Ultimately its where the bullet impacts that counts. We want to do what we can to limit the vertical dispersion of the impacts at range. As we get better at this game, things like our wobble on a barricade starts getting smaller. Our application of the fundamentals gets more automated, our wind calls get better. All of these things help us make our hit probability go up (and are arguably more important than measuring powder to the kernel..). The total sum of the skills of the shooter, an accurate rifle and the best ammo we can purchase or