Re: Primer Pocket Uniforming......twice
We ordinarily only do that drudgery once, you are squaring-up the bottom of the primer pocket and removing the punched flash-hole flanges inside the case (web). Once that material is gone the job is done. Good idea to find a flash-hole uniforming tool, opens each flash-hole a tiny bit so that they are all exactly the same. Worth doing.
Good luck with your reloading.