Dasher/BRDX neck tension

Discussion in '6BR, 6BR Improved & Wildcats' started by mr.big, May 15, 2015.

  1. mr.big

    mr.big

    Joined:
    May 15, 2014
    Messages:
    1,448
    I turned a few pieces of brass for my BRDX and the .266 bushing was too big,,with the .265 I have .0008 tension,,seems like that is very little but shot 5 rounds 105 VLD 36 gr H4350 in just over 1/2 inch at 300 yards so I am gonna do a few more and shoot a few more rounds and see how it goes,,
    anybody using much less than .001 neck tension in their Dasher/BRDX/BRX,,I dont have a .264 but if it goes haywire I can get one or start over with new brass,but it looks like it may be worth trying..
     
    Gary Smith likes this.
  2. falconpilot

    falconpilot Gold $$ Contributor

    Joined:
    Feb 1, 2008
    Messages:
    759
    I've worn out a lot of Dasher barrels...001 has always been my setup and has always given me the best results..

    Jim
     
  3. mr.big

    mr.big

    Joined:
    May 15, 2014
    Messages:
    1,448
    .001 is what I was looking for but went just a little too much,,thats why I only did 5 cases to start with,,I will try again 5 more and see how it goes,,
     
  4. gilream

    gilream

    Joined:
    Mar 3, 2010
    Messages:
    199
    Interesting. I'm brand spanking new to the 6BRX (and Bench Rest guns) and that surprises me. I've always thought in terms of .002 for most rifles. Is neck tension tied to type of powder and their differing burn rates? Or is this a standard setup for the 6mm Improved chamberings?
     
  5. delivery_boy

    delivery_boy

    Joined:
    Aug 4, 2014
    Messages:
    49
    interesting jim, are you jamming bullets or jumping them?

    Delivery_boy
     
  6. BenPerfected

    BenPerfected Gold $$ Contributor

    Joined:
    Nov 24, 2009
    Messages:
    798
    If .001 is neck wall target, another option is stay within +/- .0002 variance and then measure the actual neck tension with a PSI bullet seater and sort by PSI. This also takes in the other variables like bullet diameter, neck smoothness, annealing, etc. What else? More toys!
     
  7. ShootDots

    ShootDots Gold $$ Contributor

    Joined:
    Jan 9, 2008
    Messages:
    4,297
    Just like Jim stated...My Dashers all have 1K or slightly less, neck tension. T-Rust me, they SHOOT!
     
  8. dmoran

    dmoran Gold $$ Contributor

    Joined:
    Nov 25, 2004
    Messages:
    3,232
    Mr.Big -

    In my experience, they will change some as the brass is cycled and work-harden.
    With that said, what your learning from your brand new 5 pieces will change some.
    I strongly suggest to get a .264 bushing as well, so that you have added versatility to work with.

    1-thousands is what I typically run for neck tension in all my 6Dasher's
    Donovan
     
    DanSavage likes this.
  9. DanSavage

    DanSavage

    Joined:
    Nov 3, 2010
    Messages:
    151
    You will have too anneal to keep that light of tension consistent over the life of the brass.
     
  10. Arky

    Arky

    Joined:
    Apr 23, 2013
    Messages:
    25
    My dasher has a 268 neck, I use a 262 die. Due to the fact that all neck thickness are not the same I go one step farther, I run the cases through my mandrel die. The mandrel measures 242. This gives me .001 tension with a finished round of .265 - .266
     
  11. spclark

    spclark Gold $$ Contributor

    Joined:
    Nov 23, 2007
    Messages:
    3,401
    0.001" is what I strive for with my Palma loads, works great. Basically just enough to hold bullet in case neck during travels from loading room to match firing line w/o movement.

    I'm in Arky's camp; use a mandrel to set final neck ID. (Turned) neck thicknesses vary enough I use the smallest neck bushing I can during a sizing session with brass that can be six or seven seasons' old, then follow that with running them onto a sizing mandrel.

    And no, I don't load 'into the lands' either, too stressful when a CEASE FIRE gets called & I get powder granules dumped into my action's lugs.
     
  12. BigKev

    BigKev

    Joined:
    May 12, 2009
    Messages:
    61
    Arky,

    Just so that I'm sure that I understand what you posted are you saying that prior to seating bullets you run an "expander mandrel" down into the case mouths ?? If you don't mind me asking do you anneal after every firing ?? and do you use the mandrel before or after you anneal ?? Thanks for taking the time to answer my questions. Please feel free to PM me should you not care to discuss this on an open forum.
     

Share This Page