Gap 6.5 s case capacity

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by elkaholic, Mar 6, 2014.

  1. elkaholic

    elkaholic Well-Known Member

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    Does anyone out there know what the specs and case capacity of the 6.5 SAUM 4S is .......thanks/Rich
     
  2. Outlaw6.0

    Outlaw6.0 Well-Known Member

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    Rich,

    This is the best I could come up with on short notice.
    Gunny Sergeant
    Follows10Following0[​IMG][​IMG]
    Join Date Mar 2002Location N Kansas City, MOPosts 1,489Feedback Score 2 (100%)
    [​IMG] Originally Posted by PowerstrokeOBX[​IMG]
    What's the case fill % with H1000 or Retumbo?



    90-95% with H1000, 95-100% with Retumbo. thats giving the load of 61 grains of H1000 and 63 grains of Retumbo on a 140 class bullet

    63 grains of H1000 and the 130 Berger is about spot on 100% case fill under bullet


    New GAP Extreme Hunter in 6.5 SAUM - Page 6


    t
     

  3. CPGfan

    CPGfan Well-Known Member

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    I believe I figured 70.2 grains of water on mine
     
  4. elkaholic

    elkaholic Well-Known Member

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    Thanks guys! Do you know what the case dimensions are? Was there any change from the saum or is it just necked down? The capacity for my SS is very similar with RP brass and holds 71.5 With Norma, but my case is considerably shorter than a normal saum so it will fit in a std. mag......Rich
     
  5. barnesuser28

    barnesuser28 Well-Known Member

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    I am fairly sure it is just a straight 6.5 saum.
     
  6. elkaholic

    elkaholic Well-Known Member

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    Hey Riley, I thought you mighthave croaked!:D Haven't heard much from you for a while.
    Ya, I think it may be a straight 6.5 SAUM with a different throat spec than a std, but not sure?
     
  7. CPGfan

    CPGfan Well-Known Member

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    Rich,
    I just remeasured it. It's 72.8. Just a 7 SAUM necked down .081" freebore. That's Norma brass. 300 SAUM and once fired
     
  8. elkaholic

    elkaholic Well-Known Member

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    Ok, that makes sense. I thought it should have slightly more capacity than mine because mine is Creedmore length (body). I blew out some taper and sharpened the shoulder so it looks like I only lost about a grain of capacity. I know that short powder column is looking really efficient. We can get 3100' with160's in a 26" barrel.......rich
     
  9. CPGfan

    CPGfan Well-Known Member

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    What load are you running? My SAUM is 3030 with a 160 matrix with 61.5 Ramshot magnum in a 24" tube. It is not a hot load.
     
  10. elkaholic

    elkaholic Well-Known Member

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    Can't remember for sure, but I think it was 65 grains? Rhian chrono'd it in his rifle. He was using RL33. He actually clocked 3184', but he has a 29" barrel. We figured a 26" would easily make 3100'......Rich
     
  11. laserflat

    laserflat Well-Known Member

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    Obviously it would be a lot more trouble than just using SAUM brass, but would it be possible to form down from .300 WSM brass if thats all you could find?
     
  12. elkaholic

    elkaholic Well-Known Member

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    I tried WSM initially and it won't work because the case body is way too thick to become neck material. Most of the cases will be destroyed and the rest would take a lot of machining to be useable......Rich