What does your blue box brass measure ?

Discussion in '6BR, 6BR Improved & Wildcats' started by Jtate, Jul 9, 2018 at 7:53 PM.

  1. Jtate

    Jtate

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    What does your 6mmbr Lapua blue box brass measure at the base after you fire it in your rifle?
     
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  2. Stan Taylor

    Stan Taylor

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    My 6mmbr improved is at about 469.5 at the 200 line.
     
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  3. dmoran

    dmoran Gold $$ Contributor

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    It depends on what the chamber specs are, how many firings on the brass, and how hard there hit.
     
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  4. South Prairie jim

    South Prairie jim

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    Stan
    I have a Novice question-
    How do you ensure your measuring the .200 line?
    I've never tried and wasn't sure how to go about it
    Regards
    Jim
     
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  5. #40Fan

    #40Fan

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    I use a sharpie and color around the case. Then using a caliper locked at .200", scribe a couple lines.
     
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  6. dmoran

    dmoran Gold $$ Contributor

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    The fattest portion of the case body is what your looking for.
    A micrometer will accurately find the widest part.
    A caliper or blade mic can work as well, but a micrometer is the best measuring tool for the job - IME

    6DasherNorma.jpg
     
    Last edited: Jul 10, 2018 at 2:43 AM
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  7. geraldgee

    geraldgee Gold $$ Contributor

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    Mine measures .4702 - Once fired unsized factory ammo. My reamer print shows .4714 at .200.

    I hope this helps.

    Gerald
     
    Last edited: Jul 10, 2018 at 7:43 PM
  8. Stan Taylor

    Stan Taylor

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    We'll I normally just set my Mike on the brass where I routinely set it I just measured one like I normally do an took a set of calibers an took magic marker an put a line at 200 from the end.PS this is once fireform brass not hit hard to a br improved 40 degree shoulder.
     

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  9. South Prairie jim

    South Prairie jim

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    Thank you Gentleman
    now I know !
    Best Regards
    Jim
     
  10. Jtate

    Jtate

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    This is my dilemma, I have 1,000 pieces of once fired brass that I need to reload. The brass measures .472 at the fat point. The rifle I shot all the rounds in I do not want to use anymore, nothing wrong with the rifle just wanted something better. Bought a new rifle, the old brass will not chamber in new rifle. Once fired brass out of new rifle measures .469. A full length die does not solve the problem. So I bought a small base body die, three thousand does not seem like much but man I need to hang on the press lever like a ape can not imagine doing it a 1000 times.Once sized the brass will chamber but not cleanly bolt is sticky, which bugs the hell out of me because I use bolt lift ease or lack there of as a pressure indicator. What to do? Sell the old brass with the old rifle? and drop close to 1K in new brass? Rechamber new rifle to fit my once fired brass? I will eventually rebarrel new rifle and buy a reamer that is more suited for 70 to 90 grain bullets. What I do not understand is why someone would want or not want a small base chamber.Can anybody guide me out of this cesspool?
     
  11. South Prairie jim

    South Prairie jim

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    A Novice question
    I assume your caming over slightly with your press?
    J
     
  12. 22DASHER

    22DASHER Gold $$ Contributor

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    You are going to have to read that to me....Sorry but I can only read digital readout... o_O:eek::D
     
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  13. geraldgee

    geraldgee Gold $$ Contributor

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    The new rifle you mention above - new to you or newly chambered?

    When Lapua started manufacturing 6BR brass, its rumored that they added .002 to the web area diameter over the Remington BR brass. Obviously, chamber reamers were ground to accommodate the new brass.

    If your “new” rifle is chambered with an older Remington reamer, that MIGHT explain some of the brass problems.

    If if were me, I would verify the chamber of your “new” rifle. If it turns out to be chambered with a Remington reamer , you may well be wrestling with it forever

    OR it might not be that at all

    Good luck

    Gerald
     
  14. Stan Taylor

    Stan Taylor

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    I have to measure in tenths of thousands everyday in my job never owned a set of digital mikes my bad.LOL
     
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  15. hogpatrol

    hogpatrol Gold $$ Contributor

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    Hey Stan, How about your watch? Is it digital or is it one of those hard to read ones with hands?:(:p
     
  16. Stan Taylor

    Stan Taylor

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    20180711_075634-1.jpg
    Yes I do. 20180710_213855-1.jpg if you notice it isn't the right date either.
    We'll I also read these kind of books for settlement of the mind at the end of a long day.
     
    Last edited: Jul 11, 2018 at 7:01 AM
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  17. 22DASHER

    22DASHER Gold $$ Contributor

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    I figured you would have a Rolex!
     
  18. dmoran

    dmoran Gold $$ Contributor

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    I figured he'd have a Mickey Mouse......;)
     
  19. Jtate

    Jtate

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    New rifle to me, I bought it used.
     
  20. hogpatrol

    hogpatrol Gold $$ Contributor

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    At least a Rolex but maybe even a Patek-Phillipe?:eek::D
     
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