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Thread: 1st experiments with 6.8mm SPC, not super impressed yet

  1. #1
    Member Float Pilot's Avatar
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    Default 1st experiments with 6.8mm SPC, not super impressed yet

    REMEMBER THIS IS ONLY ONE POWDER TYPE: MORE EXPERIMENTS COMING:

    I had a bunch of Remington small rifle bench-rest primers. So I loaded up a few and also tried some RL-10x loads at the range today.
    I was not impressed.

    Yes the 100 grain bullets should have been much faster.
    AND it was the top-end loads in either the new Hornady or Speer books for RL-10x. I think it was the Hornady book that used a 16 inch DPMS carbine with a 1 in 10 twist.

    And before anyone gets excited ,,,yes I have all the loading data from the 6.8Forum site as well as from Reloaders Nest.

    The factory loads were 160 fps slower than advertised for a 16 inch barrel. Horandy supposedly uses Ball Powder in their factory loads so that might explain the problem with colder weather.

    I shot a 1.5 inch group using iron sights from my 16 inch 5.56mm AR carbine during the same range session just to make sure I was not going limp..


    I will experiment with a couple different primers with this powder. Then move on to some H-322 powder experiments in cold weather.


    Conditions:

    Rifle: Stag 16 inch flat-top, 1 in 10 twist SPCII chamber, A2 buttstock with SSS flat spring, 6 power Leupold.
    Range 100 yards
    Temp: 5 to 7 degrees F, around minus 15 C
    Light: Flat fading light on snow.

    LOADS:

    A:
    Bullet: 100 grain Sierra sp, flat base
    Powder: 28.5 grains, RL-10x compressed.
    Primer: Remington 7 1/2 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.245 inch med roll crimp.
    Velocity average: 2,455 fps 40 fps ES 2 inch group with last shot flyer No pressure signs

    B:
    Bullet: 110 grain NOSLER Accubond, boat tail
    Powder: 26.6 grains, RL-10x compressed.
    Primer: Remington 7 1/2 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.245 inch med roll crimp.
    Velocity average: 2,329 fps 29 fps ES 1 inch group with last shot flyer no pressure signs



    C:
    Bullet: 110 grain Hornady HP flat base
    Powder: 26.6 grains, RL-10x compressed.
    Primer: Remington 7 1/2 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.228 inch med roll crimp.
    Velocity average: 2,254 fps 22 fps ES 1.75 inch group with last shot flyer, no pressure signs

    D:
    Bullet: 110 grain Hornady OTM boat tail factory load listed as custom on the box
    Powder: Factory Load
    Primer: factory load
    Brass: Hornady
    COL: 2.245 inch
    Velocity average: 2,390 fps 75 fps ES 2.75 inch group with last shot flyer
    Had a couple punctured primers out of 10 rounds.
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    Floatplane,Tailwheel and Firearms Instructor- Dragonfly Aero
    Experimental Hand-Loader, NRA Life Member
    http://site.dragonflyaero.com

  2. #2
    Member RMiller's Avatar
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    Apr 2006
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    Montana
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    Default

    Thanks for sharing.

    Another possibility is the rifle may just shoot slower. I also wonder if a hotter primer may boost velocities.
    "You have given out too much reputation in the last 24 hours, try again later".

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