6BR- Ackley Improved 40 degree

Discussion in '6BR, 6BR Improved & Wildcats' started by HUNTER3401, Sep 25, 2015.

  1. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    I have both. 268 turn and 272 no-turn.
     
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  2. johara1

    johara1

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    Just maybe that is why it isn't in the 1/2" group area ??? lol.... Jim
     
  3. ngb1787

    ngb1787 Silver $$ Contributor

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    Hi Alex, are using Kreiger heavy varmint #17 barrel?
     
  4. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    mainly, yes
     
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  5. kvd

    kvd Silver $$ Contributor

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    Lapua 6mm BR Norma brass seems to be unavailable from the normal suppliers at the moment. In looking around, I found Norma 6mm BR Norma F-Class brass available from Bullet.com which is evidently enhanced in several ways from "standard" 6mm BR Norma brass - one of which is a longer neck.

    Would there be any benefit to using this specially made F-Class brass over standard 6mm BR Norma brass in producing 6BRA cartridges? Would this extra neck length just be more to trim off?

    http://www.bullets.com/products/6mm-Dasher-F-Class-Brass-Box-of-100/BL12073

    Ken
     
  6. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    You cant use it for BRA brass, the shoulder is blown forward .080. It would be a lot of work and you would end up with sub par brass when done.
     
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  7. Grimstod

    Grimstod Web Designer for PremierAccuracy.com Gold $$ Contributor

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    Using Lapua brass, what is the water capacity of this case compared to an old 6BR? Forgive me if this has already been covered but I have read this entire thread twice now and did not see any such data.
     
  8. pat fulghum

    pat fulghum Gold $$ Contributor

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    6mm BRA - 39.3 gr H2O
    6mm BR Norma - 37.8 gr H2O

    That is what I measured... "your mileage may vary"
     
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  9. kvd

    kvd Silver $$ Contributor

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    Just to make sure I'm not misinterpreting your results. The measurements are in grains not grams - correct?

    So 39.3 and 37.8 grains would be 2.547 and 2.450 cc's respectively.

    I just think better in cubic centimeters for volumes.

    Ken
     
  10. Rtheurer

    Rtheurer

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    Your Likely correct.... However... The industry standard is Grains in H2O and that is what we all relate to. So you could say Cubic Centimeters and we would all look at you like you have a Horn growing out of your head.
     
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  11. pat fulghum

    pat fulghum Gold $$ Contributor

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    Grains water is what quickload software uses.
    I use Woodinville WA tap water.
    It's mineral content has been carefully calibrated and is only available to a select few ;)
     
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  12. Sheldon N

    Sheldon N Silver $$ Contributor

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    I dunno, I'm pretty sure that Woodinville, WA tap water is made up of liberal tears. I think you have to get further to the east side of the state to get pure water. :)
     
  13. dbduff

    dbduff Gold $$ Contributor

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    Now, that's about the funniest thing I've read all day, but I don't get out a lot.
    D
     
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  14. pat fulghum

    pat fulghum Gold $$ Contributor

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    I do feel like a fish out of water over here on this side of the Cascades.

    I came from a state where you don't need a permit for concealed carry.

    I can't even begin to explain how different it is over here.
     
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  15. R.Morehouse

    R.Morehouse Gold $$ Contributor

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    There are most likely some mushrooms growing in your yard that will make you OK with the whole scene...o_Oo_Oo_O...;)
     
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  16. dbduff

    dbduff Gold $$ Contributor

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    That's pretty funny too!
    D
     
  17. AlloyTargets

    AlloyTargets Site $$ Sponsor

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    I did some chrono work yesterday with XBR8208 & Berger 80gr FB about .01" longer than my touch #. 28" Krieger, 12 TW, .236" 4 Groove, .104" FB. 59 rounds down the pipe when I started. Once fired brass, Russian Mag primer, 83deg out.

    30.5gr was 3,095 FPS (both FF and 1x F brass). Went all the way to 32.9gr @ 3,341 FPS and never did get pressure. I'm just gonna load 50 up around 3,275 and shoot a 300 yard clay match this weekend. At that point, my barrel should be broken in so I can start load work in earnest. I think I'm going to like this as a short range, fun match barrel!
     
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  18. Webster

    Webster

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    Your should jam the bullets when fire forming so the case head is always against the bolt face. If you stretch the case near the head your doing something wrong. False shoulder method accomplishes the same thing. Seems easier to jam if it's appropriate for your particular cartridge.
     
  19. holstil

    holstil Silver $$ Contributor

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    I'm thinking you don't need to jam. The brass should fit snug.
    At least that's the way I chamber my other AI's.
    You got .004" from go to no go.
     
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  20. johara1

    johara1

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    With 8208 XBR I think the lot to lot variation is a quite noticeable in some cases. Remember it was used in the PPC. to start with and has slowed down a bunch over the first lot. It still does shoot good with the light bullet and I have had some success with the 103's with it, but I need a little more time with it. ...... Jim
     
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