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De-Priming before Sizing

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  • Ronin6
    Member
    • Dec 2021
    • 321

    De-Priming before Sizing

    Why do some reloaders remove the spent primers in a separate step vs during the sizing process?

    Neck sizing only or also FL sizing?
  • #2
    ar15barrels
    I need a LIFE!!
    • Jan 2006
    • 57036

    Some people go crazy about having their primer pockets shiny clean so they decap the cases before cleaning the cases so that the pockets will be cleaned out.

    Clean primer pockets help accuracy and reliability just about as much as clean underwear.
    Maybe a little less than a clean hat does.
    Randall Rausch

    AR work: www.ar15barrels.com
    Bolt actions: www.700barrels.com
    Foreign Semi Autos: www.akbarrels.com
    Barrel, sight and trigger work on most pistols and shotguns.
    Most work performed while-you-wait.

    Comment

    • #3
      RickD427
      CGN/CGSSA Contributor - Lifetime
      CGN Contributor - Lifetime
      • Jan 2007
      • 9263

      I do it because I wet tumble my cases before sizing and I want to clean the primer pockets during the tumbling process.

      I dry tumble the cases, with a case polishing additive after sizing to remove the die sizing wax and to put a protective coating on the cases.
      If you build a man a fire, you'll keep him warm for the evening. If you set a man on fire, you'll keep him warm for the rest of his life.

      Comment

      • #4
        ar15barrels
        I need a LIFE!!
        • Jan 2006
        • 57036

        There's one of those crazy people.
        Randall Rausch

        AR work: www.ar15barrels.com
        Bolt actions: www.700barrels.com
        Foreign Semi Autos: www.akbarrels.com
        Barrel, sight and trigger work on most pistols and shotguns.
        Most work performed while-you-wait.

        Comment

        • #5
          L4D
          Veteran Member
          • Sep 2009
          • 3053

          im crazy. I deprime, wet tumble, resize then I wash again to get the lube off.
          RIP iTrader: Feedback Profile for L4D

          Comment

          • #6
            RickD427
            CGN/CGSSA Contributor - Lifetime
            CGN Contributor - Lifetime
            • Jan 2007
            • 9263

            Originally posted by ar15barrels
            There's one of those crazy people.
            And damn proud of it too.

            I shot tactical rifles for many years and used quite conventional reloading techniques, and was pretty happy with 1/2 MOA groups.

            Then I caught the benchrest bug and like a lot of benchrest folks have become fanatical about my loads and load development. It paid off, I went from 1/2" groups at 100 yards and just shot a .292" group at 200 yards (that's a 1/8 MOA).

            That "Crazy" stuff pays off.
            If you build a man a fire, you'll keep him warm for the evening. If you set a man on fire, you'll keep him warm for the rest of his life.

            Comment

            • #7
              ar15barrels
              I need a LIFE!!
              • Jan 2006
              • 57036

              Originally posted by RickD427
              And damn proud of it too.

              I shot tactical rifles for many years and used quite conventional reloading techniques, and was pretty happy with 1/2 MOA groups.

              Then I caught the benchrest bug and like a lot of benchrest folks have become fanatical about my loads and load development. It paid off, I went from 1/2" groups at 100 yards and just shot a .292" group at 200 yards (that's a 1/8 MOA).

              That "Crazy" stuff pays off.
              I shot a 0.95" 3 shot group at 600yds in 5 seconds (no joke) with dirty primer pockets.
              How much better do you figure it would have been with clean primer pockets?
              Randall Rausch

              AR work: www.ar15barrels.com
              Bolt actions: www.700barrels.com
              Foreign Semi Autos: www.akbarrels.com
              Barrel, sight and trigger work on most pistols and shotguns.
              Most work performed while-you-wait.

              Comment

              • #8
                RickD427
                CGN/CGSSA Contributor - Lifetime
                CGN Contributor - Lifetime
                • Jan 2007
                • 9263

                Originally posted by ar15barrels
                I shot a 0.95" 3 shot group at 600yds in 5 seconds (no joke) with dirty primer pockets.
                How much better do you figure it would have been with clean primer pockets?
                As I'm sure you're well aware, there a lot of "Voodoo Magic" involved in benchrest. I'm still very much a newbie and learning the sport (and figuring out the "Voodoo")

                But from a purely geometrical point of view .262 at 200 yards would be equal to .876 at 600 yards. The difference between .876 and .950 would be .074.

                Since we're only talking about dirty primer pockets, I'd say the difference is .074"
                If you build a man a fire, you'll keep him warm for the evening. If you set a man on fire, you'll keep him warm for the rest of his life.

                Comment

                • #9
                  pacrat
                  I need a LIFE!!
                  • May 2014
                  • 10270

                  Originally posted by RickD427
                  As I'm sure you're well aware, there a lot of "Voodoo Magic" involved in benchrest. I'm still very much a newbie and learning the sport (and figuring out the "Voodoo")

                  But from a purely geometrical point of view .262 at 200 yards would be equal to .876 at 600 yards. The difference between .876 and .950 would be .074.

                  Since we're only talking about dirty primer pockets, I'd say the difference is .074"

                  Yet shooting in the real world is quite a bit more involved than just the geometric aspect. Or it would not be the best shooter, with the most accurate rifle, and consistent loads who wins on any given day.

                  It would be whichever "nerd" showed up with the biggest calculator on the firing line.

                  Conversations like this makes me glad I never got bit by the Benchy Bug.

                  Comment

                  • #10
                    Cheep
                    Senior Member
                    • Apr 2009
                    • 1312

                    I deprime then wet tumble so the brass can dry all the way, the spent primer will hold water.
                    Originally posted by NOMADCHRIS
                    your asking a question about asking a question ??? just ask the damn question!!!

                    Comment

                    • #11
                      glassparman
                      Senior Member
                      • Aug 2012
                      • 697

                      I like my brass looking like brand new so I deprime AND size in one step then I wet tumble.

                      It's all a matter of preference. Do what you like.
                      sigpic"There is no greater feel than to be in control of 56 tons of steel and watching that 105mm round go down range and blow something up."

                      Comment

                      • #12
                        Dirtlaw
                        CGN/CGSSA Contributor - Lifetime
                        CGN Contributor - Lifetime
                        • Apr 2018
                        • 3480

                        Originally posted by glassparman
                        I like my brass looking like brand new so I deprime AND size in one step then I wet tumble.

                        It's all a matter of preference. Do what you like.
                        glassparman has a good point. Many people do this because they enjoy it -- it makes them feel good. I can rough machine a part that will work, as an example, but for some reason I feel better when the part looks perfectly machined.

                        Comment

                        • #13
                          morthrane
                          Senior Member
                          • Feb 2006
                          • 954

                          Originally posted by Cheep
                          I deprime then wet tumble so the brass can dry all the way, the spent primer will hold water.
                          This. Plus I can deprime with a dedicated decapping die in a handheld while watching TV.

                          (In theory cleaning the brass before sizing keeps your sizing die from getting scratched up by crud, but who knows if that's actually useful and/or true)

                          Comment

                          • #14
                            ar15barrels
                            I need a LIFE!!
                            • Jan 2006
                            • 57036

                            Originally posted by RickD427
                            But from a purely geometrical point of view .262 at 200 yards would be equal to .876 at 600 yards. The difference between .876 and .950 would be .074.
                            You are missing the wind part.
                            It's much more important than the basic geometry part at 600.
                            Randall Rausch

                            AR work: www.ar15barrels.com
                            Bolt actions: www.700barrels.com
                            Foreign Semi Autos: www.akbarrels.com
                            Barrel, sight and trigger work on most pistols and shotguns.
                            Most work performed while-you-wait.

                            Comment

                            • #15
                              G38xOC
                              Veteran Member
                              • Dec 2009
                              • 3742

                              I read somewhere they do it for long term storage .

                              Comment

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