6bra Fireforming Tubb TMS AR Comp

Discussion in 'Reloading Forum (All Calibers)' started by urbanrifleman, Dec 14, 2019.

  1. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    Took my Rock Creek 1-8 6br prefit with about 1200 rounds and rechambered it with my fingers to 6bra. Headspace to 4 short. Bone stock Remington 700 single shot from Buds Guns trued by hand by my smith. Jewel trigger. Stock made from CMP 40X stock by my buddy Terry Tabor.

    Tubb said shot several TMS bullets to clean up the throat. So I did.

    Fire forming AR Comp 29.2 to 29.9 with 108 Berger. Jumped 25 thou.

    Shot with Tubb bipod and squeeze bag. Tubb brake.

     
    Last edited: Dec 14, 2019
  2. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    Best group after about 25 rounds post TMS rounds. 20191214_113339.jpg
     
  3. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    Groups immediately preceding that group. 20191214_113348.jpg 20191214_113403.jpg
     

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  4. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    Keep in mind these are not benchrest groups. Bipod and squeeze bag. Scope is 20 power.
     
  5. Rushty

    Rushty Silver $$ Contributor

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    Coming along nicely..
     
  6. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    No load work up. I have no idea which load shot the best, they all shot tiny. Velocities were single digits. Range from 2825 to 2855 from low to high. All shot tiny.
     
  7. 22DASHER

    22DASHER Gold $$ Contributor

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    Welcome to the fun of anything based off the 6 BR case. Pretty hard not to get them to shoot.
     
  8. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    I've been shooting 6br for about a decade. The 6bra seems to be even more forgiving.

    I posted to show the TMS bullets didn't ruin my barrel. Quite the contrary. And AR comp flat shoots.
     
  9. Okiehunter67

    Okiehunter67

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    Did the TMS move the lands out any??
     
  10. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    The lands ended up right where they should have been after break in. If it did, it wasn't much. Maybe a thou or two. Hard to tell. Break in will move the lands a bit.
     
  11. urbanrifleman

    urbanrifleman Site $$ Sponsor

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    More fireforming testing. 108 Bergers AR Comp. 20200102_140811.jpg

    In rows:

    29.2
    29.4
    29.6
    29.9
    30.2

    29.6 and 29.9 shot the best I suppose. None sucked. Certainly not bad for a bipod. 20200102_140811.jpg
     

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