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  1. #1
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    Default Hodgdon Superperformance Powder for 6.8 SPC

    I did a search and there is some stuff on the Hodgon Superperformance powder, but it's many months old, so I bring this back to quiz. Any data on the Hodgdon Superperformance of the CFE 223 powders for load data on the 6.8 SPC II?
    http://www.hodgdon.com/rifle.html
    Sic Semper Tyrannis "Thus always to tyrants"

    Vern
    Semper Fi
    taurus45acp. com personal website with NRA-ILA feed and interesting links.
    Forgiveness is between them and God, it's my job to arrange the meeting

  2. #2
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    Default

    Quote Originally Posted by AKsarben View Post
    I did a search and there is some stuff on the Hodgon Superperformance powder, but it's many months old, so I bring this back to quiz. Any data on the Hodgdon Superperformance of the CFE 223 powders for load data on the 6.8 SPC II?
    http://www.hodgdon.com/rifle.html
    CFE 223 sounds like the powder St Marks made for the new 5.56 green ammo.

    Looking at the load data for CFE 223 I can tell you it will be way to slow, close to BLC-2, TAC, AA2520 in burn rate.

    Lead Free 5.56mm BALL POWDER® Propellant
    I
    • BALL POWDER® Propellant designed for lead-free projectiles and primers
    • Propellant additives developed for barrel decoppering

    Green 5.56mm BALL POWDER® Propellant
    Projectile 62.0 grain, 20" barrel
    Propellant 5.56mm round Velocity(ft/s) Pressure(psi)

    WC 844 - Standard M855 3020 55,000
    SMP® 842 - Green 5.56mm 3020 54,200

    This is the powder we need(to try anyway, may not be as good as 2200), I had a line on some a while back and lost it before I could get any.

    6.8mm REM SPC vs. 5.56mm M855

    5.56mm M855 projectile 62.0 gr, 6.8mm projectile 115 gr, barrel 16"
    Propellant Round Velocity(ft/s) K.E.(lbf-ft) Pressure(psi)
    WC 844 - 5.56mm M855 2900 1157 55,000
    SMP® 745 - 6.8mm REM SPC 2500 1593 53,000

    •6.8mm has ~40% more K.E. than the standard 5.56mm
    Last edited by EWP; 12-10-2011 at 04:30 AM.

  3. #3
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    Default

    Superformance is also way too slow. If it works well in the WSM calibers, it will not work with the 6.8. Hodgdon lists it as being slower than IMR4831.

  4. #4
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    I found the burn rate chart... finally, and it does show it to be a rather slower burn powder. Others showed a lot more promise, and I even seen some loading from Hodgdon for one they have called "Lil' Gun", which may be a bit on the fast side.

    FWIW, one I have had very good success with for accurate loads is IMR's powder 8208XBR. I find that loading the case nearly full, 1/8" down from the neck, and tapping to settle the powder gives you a pretty decent compressed load, with great accuracy and no signs of excessive pressure on my 2 uppers of 6.8 SPC II - One from Harrison Beene a 16" 1:11.25 twist with 5R rifiling and the other a 4 groove 1:11 twist from Bison, but in 18" barrel. Both shooting the 100gr bullets of Speer and Sierra. Believe that was around 30 gr of IMR 8208 XBR.
    Sic Semper Tyrannis "Thus always to tyrants"

    Vern
    Semper Fi
    taurus45acp. com personal website with NRA-ILA feed and interesting links.
    Forgiveness is between them and God, it's my job to arrange the meeting


 

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