Accuracy fixed.

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  • Bigs28
    Chieftain
    • Feb 2016
    • 1786

    Accuracy fixed.

    So quick back story. Spent over a year collecting quality parts. Assembled them all about 2-3 months ago. Went to the range and accuracy sucked. 8" groups of complete randomness at 50 yards. I was extremely disappointed.

    Several YouTube videos, lots of research here, and more tools ordered.

    On Monday I took the upper apart. Hand lapped the upper receiver. Clearly was not even as the top left was the last to turn silver. Bedded the barrel with blue loctite, reassembled and went to the range today.

    TAC DRIVER.

    bullet inside of bullet. You could only truly identify 3 shots in my 4 shot groups. Again only at 50 yards but I'm using a cheap Nikon p223 3x32 scope. I'm ordering the vortex viper pst gen 2 2-10x32 after next week's overtime so then I will dial in at 100 yards.

    So excited.

    Thanks for everyone's help, advice, and guidance on this forum. This would have been much more difficult to have achieved without you guys.
  • NugginFutz
    Chieftain
    • Aug 2013
    • 2622

    #2
    Glad you sorted out your issues. Also nice that you provided empirical evidence that lapping the upper to the barrel extension can and does (often) provide benefits.

    Happy shooting!
    If it's true that we are here to help others, then what exactly are the others here for?

    Comment

    • Steamburn
      Warrior
      • Apr 2015
      • 133

      #3
      Always lap!!!
      My first build was a 30-06 built on an old Mauser action. I was under the guidance of a group of retired machinists from the Navy that had set up a gunsmithing shop as a hobby and were always glad to have an enthusiastic apprentice around.
      They taught me how to fit a barrel to the action and once I thought I was done, I was asked to disassemble it, including the bolt parts. Next step was to spend quite a few hours applying valve grinding compound to the lugs after painting them with Prussian blue, back and forth until the lugs in the bolt matched the lugs in the action to perfection. Once everything was perfectly clean, I assembled it back again and checked for headspace once more. It ended up being a nice shooter. I still have that rifle.

      Comment

      • Chrazy-Chris
        Warrior
        • Aug 2015
        • 169

        #4
        Nice! I suspect that barrel nut was not tight enough the first time around - did it come off easily when you broke it down?

        I just started lapping my uppers and I'm a big fan! It's a quick easy step and a fairly inexpensive tool.

        Comment

        • Bigs28
          Chieftain
          • Feb 2016
          • 1786

          #5
          The barrel nut was on pretty tight but once off there was allot of play between the barrel and upper receiver.

          Comment

          • Bigs28
            Chieftain
            • Feb 2016
            • 1786

            #6
            Instead of starting a new thread, I will just add to this one. I went to the range again today with some hornady black ELD-M. I cant believe the difference that lapping the upper receiver and bedding the barrel has made to the accuracy. I was originally going to scrap the upper out of pure disappointment. Im glad this forum was here for me to learn off of and after a couple of easy fixes this gun is doing what I originally knew it would be capable of.


            This is the target from before I lapped the upper and bedded the barrel and a target I shot today with the ELD-M after lapping and bedding the barrel. Thanks again for all the input. Couldnt have done it as easily without you guys.
            Attached Files

            Comment

            • bj139
              Chieftain
              • Mar 2017
              • 1968

              #7
              I just thought I'd mention the difference between accuracy and precision.

              Accuracy is hitting what you are aiming at (hitting bullseye).

              Precision is repeat ability (group size).

              Comment

              • Bigs28
                Chieftain
                • Feb 2016
                • 1786

                #8
                Ok so lapping and bedding fixed the precision.

                Comment

                • VASCAR2
                  Chieftain
                  • Mar 2011
                  • 6218

                  #9
                  Thanks for posting the update. Glad to see the forum was beneficial to you!

                  Comment

                  • S.Kargoh
                    Unwashed
                    • May 2017
                    • 7

                    #10
                    Should the blue loctite be green instead? For cylindrical sleeve mating of loose tolerances?


                    And also, do you decrease it and then put the loctite in? Because decreasing seems like it would be difficult due to the use of grease on the bbl nut?

                    Comment

                    • diddlyv
                      Warrior
                      • Aug 2016
                      • 352

                      #11
                      the grease does not go between the receiver and barrel extension, it only goes on the treads and should never contact anything but those threads and the barrel nut. The blue loctite goes on the barrel extension and helps fill any slack between the barrel extension and the receiver. It is not applied to go between the shoulder of the barrel extension and the front of the receiver, that is what the lapping was all about
                      Queen of Battle
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                      Life NRA, DAV ,VFW, SASS

                      Comment

                      • rabiddawg
                        Chieftain
                        • Feb 2013
                        • 1664

                        #12
                        Originally posted by S.Kargoh View Post
                        Should the blue loctite be green instead? For cylindrical sleeve mating of loose tolerances?

                        And also, do you decrease it and then put the loctite in? Because decreasing seems like it would be difficult due to the use of grease on the bbl nut?

                        Did s sneaky write this?
                        Last edited by rabiddawg; 06-30-2017, 03:56 AM.
                        Knowing everthing isnt as important as knowing where to find it.

                        Mark Twain

                        http://www.65grendel.com/forum/showt...2-Yd-Whitetail

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                        • BluntForceTrauma
                          Administrator
                          • Feb 2011
                          • 3897

                          #13
                          Sweet. Good job troubleshooting and now have some fun!
                          :: 6.5 GRENDEL Deer and Targets :: 6mmARC Targets and Varmints and Deer :: 22 ARC Varmints and Targets

                          :: I Drank the Water :: Revelation 21:6 ::

                          Comment

                          • biodsl
                            Chieftain
                            • Aug 2011
                            • 1714

                            #14
                            Originally posted by Steamburn View Post
                            Always lap!!!
                            What media should be used?
                            Paul Peloquin

                            Did government credibility die of Covid or with Covid?

                            Comment

                            • The Profit Joseph Sith
                              Warrior
                              • Nov 2016
                              • 596

                              #15
                              Originally posted by NugginFutz View Post
                              Glad you sorted out your issues. Also nice that you provided empirical evidence that lapping the upper to the barrel extension can and does (often) provide benefits.

                              Happy shooting!
                              Seconded.. Thanks for posting.
                              I would use valve grinding compound because I already have some. The clover compound on Amazon comes in many different grit sizes. I'd reccomend NOT using TO fine of a grit you want some texture there for the "glue" to stick to. Maybe I'm wrong but typically you want surface texture. Something between 180-320 grit I'd think would be best.
                              But like a previous poster noted most of the bedding is between the stub and receiver. The I.D. and O.D. not around the extension collar and face if the receiver..
                              Last edited by The Profit Joseph Sith; 07-01-2017, 10:48 PM.

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