6BRA load data

Discussion in '6BR, 6BR Improved & Wildcats' started by Alex Wheeler, May 6, 2018.

  1. CaptainMal

    CaptainMal Silver $$ Contributor

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    Heck Bart ... I can do that good and it would only take one shot.
     
  2. Nature Boy

    Nature Boy Gold $$ Contributor

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    Lederer barrel - check, that's what I'm shooting
    30.5g H4895 - check, that's my load too
    105 Gungnirs - ahhh, that's what I'm missing

    oh, and maybe have Bart come pull the trigger for me too
     
    SPJ and BartsBullets like this.
  3. Forward543

    Forward543

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    What range on 8208 do you think would work in the 105 range?
     
  4. JasonPeterson

    JasonPeterson Gold $$ Contributor

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    I would start at 28.5 and work your way up. I have heard of guys finding accuracy (and pressure) between 29.5 and 31.5 depending on a particular barrel. I prefer a ladder with .2gr to .3gr increments until I find a promising node and then test again within that area at .1 or less.

    JP

     
  5. FiftyOuts

    FiftyOuts Silver $$ Contributor

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  6. mr.big

    mr.big

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    I tried 8208 and 104 BIBs in my 7.83 twist Brux today at 300 yards..started at 30 and at 31.2 it looked pretty good 3 shot groups..chronos 2928..more tests latter. IMG_20190202_150436_803.jpg
     
  7. moondog

    moondog Gold $$ Contributor

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    Tried a new load with Berger 108BT
    30.5 H-4895, BR4, jam .007, 2930 fps in a 27"
    Chanlynn barrel (left twist) 2" vertical at 850
    I've been shooting 105 Hybrids with good results and a little bit faster but, these will shoot inside of them.
     
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  8. Alexander-M

    Alexander-M Gold $$ Contributor

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    My new 6mm BR-A has a Panda action, a Brux 30” 7.83:1 barrel, with a Wheeler 6BRA No.1 Reamer from JGS.

    I have not done much load development as my next batch of bullets will be the Berger 108 gr BT Target, and I will use the once-fired brass for that.

    In the meantime, I have been using both Hydro-Formed brass (from DJ’s) and Fire-Forming myself with Berger 105 gr Hybrids, and both are doing very well.

    With the Hydro-Formed brass, 31.2 gr of Varget, CCI 450’s, and 0.015” jump, the 5-round 600-yd groups are about 1.5”.
    At 1,115 yards yesterday, I could consistently strike a six-inch diameter red plate. I was happy. (BTW, muzzled speed was 2920 fps.)

    I have also been shooting the Lapua 6mm BR brass for fire-forming, and have been pleasantly surprised. I have to jam the bullets about 0.015” to insure that the CCI 450’s go off. Using 30.00 gr of Varget has resulted in very small groups. Speed is 2850 fps.

    Here is an example of the BR fire-forming int BR-A. After I shot these 10 rounds, I quit to save the ammo for the next 600-yard match, but due to inclement weather I have not been able to shoot a match yet. The first two shots, at the bottom of the X-ring, where sighters, and I adjusted elevation from that.
    (Yes, as I wrote on the target, the temperature to start was 11° and 15° when done about an hour later.)

    BRA 2018-12-10 FireForming Lapua BR light sm IMG_3208.jpg

    I think the 0.69" (0.114 moa) vertical for 8 rounds is pretty good. Even including the first two rounds before I adjusted elevation, 2.09" is not bad.

    Alex
     
    Last edited: Feb 4, 2019
    dgeesaman, LA50SHOOTER, MTSLW and 8 others like this.
  9. arm017

    arm017

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    Reading through this thread - There seemed to be overwhelming support of H4895 for the BRA then rumblings of inconsistencies and issues with it. Is H4895/cci 450 still deemed the top choice of powder for the cartridge?
     
  10. Nature Boy

    Nature Boy Gold $$ Contributor

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    I opend a new lot of H4895 recently and saw 100 fps increase in velocity over the previous lot.

    Interestingly, I’m still in an accurate node with my 6BRA. Still shooting 5 shot groups in the 1’s and 2’s at 200 yards and cleaning targets at 600 yards in F Class

    Also using it in my .308 and am now seeing pressure signs with my 185 Hybrid loads where there wasn’t any from previous lot. It’s also keeping its accuracy but I’m going to have to work up a new load for it.

    First time for me to see this much lot to lot variation
     
  11. mikeeg02

    mikeeg02 Michael Glantz Gold $$ Contributor

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    I have a good load with rl-15, h4895, and varget. The rl15 load had the smallest group at 1k on paper, varget second smallest. H4895 was pretty consistent 6" gun. I've started doing more so its not a fair shake, but I dont think you can go wrong with any of those powder options. I tried/use all 3 powders, with 3 different bullets, and 3 different primers, in 4 different barrels, and they all work. Just require me to do my part, which I am working on.

    I try to buy 8# jugs (usually several of the same lot if I can) to not have to deal with lot to lot variations. I think with any powder you're going to get that to some degree. If you change any one component, you've got to test it.
     
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  12. 72coug

    72coug

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    alex m, nice fire form target, i fire formed my lapua br brass to bra last season with 30.9 gr varget pushing 105 berg hyb's and cci450 primers, i jammed em .010". my fps is right at 2900 or 2910, and i believe im shooting same barrel as yours, sure is fun shooting a capable rig!!
     
  13. Panda Nick

    Panda Nick Gold $$ Contributor

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    Up...hopefully forum boss will pin this as they have for br and dasher
     
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  14. skotydontno

    skotydontno

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    anyone tried dtacs?
     
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  15. SoDakDasher

    SoDakDasher Gold $$ Contributor

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    Just started to load for my bra. Fire forming and break in. 101 rounds done. Lone peak action, benchmark 26” 1:7.75. Started with 30.5 Varget under Berger 105 hybrids. CCI 450’s. Still a work in progress but getting there. Velocity avg was 2830 out of ten random shots of the lot. C685978B-F3A4-447D-9E28-46334F40D428.jpeg

    Not what my dasher can do but still early in the process. Jammed for these. Will back off on depth and charge to start playing with. Funny how this “hobby” turns into work to get where you want to be. Lol
     
  16. Panda Nick

    Panda Nick Gold $$ Contributor

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  17. Rushty

    Rushty Silver $$ Contributor

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    Second BRA Kreiger 8tw barrel likes 30.25gns 4895, 8jam 103s for 2990fps, cci450s... Still liking this little cartridge..
     
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  18. Nature Boy

    Nature Boy Gold $$ Contributor

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    Tweaked my load a bit and was rewarded last month with a clean in all three F Class matches at 600 yards. 600-36X

    30.8g H4895
    108g Berger BT
    BR4 primer
    2,920 fps, ES 17, SD 7

    First target of the day, 200 - 14X

    [​IMG]
     
  19. Alexander-M

    Alexander-M Gold $$ Contributor

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    Good shooting!
    Jump or jam, and how much?
    Thx!
    Alex
     
  20. arm017

    arm017

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    I have shot 4 barrels that have all been very similar loads in each reamer based on wheeler print

    28" Krieger/237 bore/4 groove/7.5 twist x 3
    28" Bartlein/237 bore/5R/ 7.5 twist

    H4895 30.2 gr - 2925 FPS
    F205M/450s
    105 hybrid @ 17 K jump


    Varget 31.4 gr- 2940FPS
    F205M/ 450s
    105 Hybrid @ 10 K jump

    Varget 31.5 gr - 2910 FPS
    F205M / 450s
    Berget 108 HPBT @ 5 K jump
     
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