300rum, 208 A-Max, Moly coated, Slow

Discussion in 'Reloading' started by joel0407, Mar 9, 2009.

  1. joel0407

    joel0407 Well-Known Member

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    I'm loading 87gn of Retumbo behind the 208gn A-Max which I have moly coated and only getting 2751fps(AVG).

    83gn = 2650fps
    84.5gn = 2709fps
    87gn = 2751fps (No sign of pressure)

    All loads over crony and all 3 shot averages with retumbo.

    Max listed load is 86gn but I'm far from getting any signs of pressure. Web site "steve 8" lists from 79.3 to 96 gn for a 200gn projectile.

    Rifle is a factory Remington Sendero SFII 26" barrel.

    I was expecting around 3000fps for this projectile.

    Should I keep pushing up the charge.

    Help needed.
     
  2. ZSteinle

    ZSteinle Well-Known Member

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    96 gr. sounds about right for a 200gr. projectile. Also i am almost positive that moly coated bullets require more powder to build pressure and get equal velocity being that they slide down the barrel easier.
     
  3. joel0407

    joel0407 Well-Known Member

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    Been doing a bit of reading and getting the idea that 96 is about max and alot load up around 94 - 95.

    Dont know why Hodsgon lists such a low load as max. Theres being careful but at 86 I might as well use a 308win.
     
  4. GLZ

    GLZ Well-Known Member

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    Hodgdon lists 86 as Max with the Barnes XFB but lists 95.5 as max with the Nosler Accubond. I would think the A-Max is closer in profile to the AB than the XFB
     
  5. Autorotate

    Autorotate Well-Known Member

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    I think you have say this first when posting load data nowadays.....Don't blow up your gun!

    That said...here's what Quickload suggests with a COAL of 3.600.

    Your current 87 grain load...Quickload suggests a muzzle velocity of 2749 fps, with peak chamber pressure of 48210 psi.

    [​IMG]

    Quickload also suggests SAAMI max pressure will occur with a load of 95.0 grains of Retumbo, and a COAL of 3.600. It also suggests you should achieve a muzzle velocity of 2976 fps with your 26" barrel.

    [​IMG]

    As with any loading data, ensure you start with a lower charge and work up from there.

    Hope this helps.
     
  6. Autorotate

    Autorotate Well-Known Member

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    Oh yes...I almost forgot. That 95 grain charge may "crunch" some when seating the bullet, as it's listed as 101%, a slightly compressed load. With any luck you may very well achieve what your goals prior to getting to the max load.
     
  7. Spanners

    Spanners Well-Known Member

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    The old Hodgdon data was wrong.. as as ADI (same powder) however the new Hodgdon manual online that you can DL, had the right loads listed.
     
  8. joel0407

    joel0407 Well-Known Member

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    So wrong if fact you can count the time between the firing ping sticking and the bullet firing at 82 grains. DANGEROUS