My New 6bras

Discussion in '6BR, 6BR Improved & Wildcats' started by urbanrifleman, Sep 10, 2019.

  1. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    I decided that I would completely abandon all 6mms and shoot 6bra. Across the board.

    My first 6bra is a Brux 7.5 with the Alex Wheeler 104 fb chamber but my reamer is a 272 neck. Then I have my varmint rifle with a Rock Creek 8 twist same chamber.

    Waiting for my 12 twist Bartlein barrel for my short range action.

    Lt32 is great so far for light bullets but I'm going to test ar comp and if it continues to perform I am just going to shoot that for a while in all weights. I am so tired of chasing temp changes and Alliant powders are my favorites.
     
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  2. ttfreestyle

    ttfreestyle Gold $$ Contributor

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    We have done the same thing, both of our 6mm benchrest guns are 6bra’s and also getting a 6bra barrel for my varmint rig. Really like how accurate they are even while fireforming and how consistent the brass turns out.
     
  3. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    6bra is the obvious choice for varmint hunting.
     
  4. ttfreestyle

    ttfreestyle Gold $$ Contributor

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    For us it surely was, we will have brass that is retired from benchrest that’s still great for varmiting(I am not a serious varmint guy) and playing on steel. Win win!
     
  5. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    That is EXACTLY what I'm doing. Using my old brass for varmints.
     
  6. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    My new 7.5 Brux 6bra barrel with Alex Wheeler 104 reamer and 272 neck. Fireforming with 80 Bergers and AR Comp. 31 to 32.5 grains. 32 grains was single digit spreads right at 3250. Only varied a few fps total and many were the same velocity exactly.

    Ar comp is impressive.

    20190913_104233.jpg
     
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  7. Mark W

    Mark W Gold $$ Contributor

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    I’m kinda liking 8208 right now. It’s what Bart S recommended for me to try with his 80 Gr Boat Tail Dominators. It’s giving me some 5 shot groups in the 2s with single digit SDs and 3310 average FPS at 32.7 grains. I think I will load some more at 32.6 and play with the seating depth a little.

    upload_2019-9-14_20-14-20.jpeg
     
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  8. Link

    Link Silver $$ Contributor

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  9. Mark W

    Mark W Gold $$ Contributor

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  10. Link

    Link Silver $$ Contributor

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    1:12 twist ? Wondering how light a bullet you can shoot in a 1-8 twist accurately.
     
  11. Mark W

    Mark W Gold $$ Contributor

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    How the throat is set up will be your limiting factor more so than the twist. The 1:8 will be fine with light bullets unless it’s throated for 105s, then you will be jumping then too far for best accuracy.
     
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  12. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    8208 appears to be closer to lt32. Ar comp is a bit slower.

    I'm still shooting fire forming loads. I have not recieved my 12 twist barrel yet. But it will be the same chamber.
     
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  13. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    I am testing 80s and 70s in the same chamber with my 7.5 twist. I would say it's quite accurate.
     
  14. mr.big

    mr.big

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    Idk about Barts BT but the 80 Berger FB will work fine in a .104 freebore...
     
  15. Link

    Link Silver $$ Contributor

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    I sized a dummy case then cut the neck off 1/2 way, loaded a bullet then slid the collar onto the bullet. 1.565'' looks like the total measurement from the head to where the neck touches the freebore or lands. If I size my brass to 1.550'' what is that measurement, freebore? Or do I measure a loaded round from the head to where it touches the lands and subtract 1.550'' I think I answered me lol. thanks
     
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  16. Dgd6mm

    Dgd6mm

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    My wife just got a couple new bras...she ordered them from J.C. Penny.:D
     
  17. Link

    Link Silver $$ Contributor

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    Thanks for your valuable input .:rolleyes:
     
    Last edited: Sep 30, 2019
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  18. Dgd6mm

    Dgd6mm

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    Your welcome!:rolleyes:
     
  19. Nature Boy

    Nature Boy Gold $$ Contributor

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    how did they fit you? :D
     
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  20. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    7.5 Brux, 108 Berger moly 20191003_202656.jpg 20191003_202709.jpg 20191003_202704.jpg . I shot these is horrible conditions. No wind flags. 10 mph gusts from 7 o'clock. The bottom group is was really blasting maybe to 20 mph.
     
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