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Thread: 90 Grain Sierra HP in 6.8 SPC experiments

  1. #1
    Member Float Pilot's Avatar
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    Default 90 Grain Sierra HP in 6.8 SPC experiments

    6.8x43mm Range Report 90 Grain Sierra Hollow Point
    Conditions:
    Rifle: Stag 16 inch flat-top, 1 in 10 twist SPCII chamber, A2 buttstock with Tubbs flat spring
    Sights: Fixed 6 power Leupold. FXIII 42mm Heavy Duplex
    Range 100 yards
    Temp: NEG 08 degrees F , Negative 22 C, Light wind
    Light: Flat fading light on snow.



    1.
    Bullet: 90 grain Sierra Hollow Point, flat base
    Powder: 30.1 grains, H-322.
    Primer: CCI-BR-4 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.245 inch Lee Crimp.
    Velocity average: 2,705 fps 40 fps ES

    1.5 inch group with last shot flyer to 2 Does not load well No pressure signs


    2:
    Bullet: 90 grain Sierra Hollow Point, flat base
    Powder: 33.5 grains, AA-2230
    Primer: CCI-BR-4 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.245 inch Lee Crimp.
    Velocity average: 2,647 fps 43 fps ES

    0.5 inch group with last shot flyer to 0.75 Does not load well No pressure signs


    3:
    Bullet: 90 grain Sierra Hollow Point, flat base
    Powder: 27.5 grains, RL-7
    Primer: CCI-BR-4 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.245 inch Lee Crimp.
    Velocity average: 2,664 fps 47 fps ES

    1.25 inch group Does not load well Some pressure signs

    4:
    Bullet: 90 grain Sierra Hollow Point, flat base
    Powder: 27.0 grains AA 1680
    Primer: CCI-BR-4 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.245 inch Lee Crimp.
    Velocity average: 2,645 fps 74 fps ES

    1.0 inch group Does not load well NO pressure signs

    5:
    Bullet: 90 grain Sierra Hollow Point, flat base
    Powder: 28.5 grains H-4198
    Primer: CCI-BR-4 bench rest small rifle, hand seated
    Brass: SSA
    COL: 2.245 inch Lee Crimp.
    Velocity average:
    2,883 fps 24 fps ES
    1.0 inch group including flyers Does not load well HIGH pressure signs
    Has potential for accuracy if it would load without hanging up.


    Floatplane,Tailwheel and Firearms Instructor- Dragonfly Aero
    Experimental Hand-Loader, NRA Life Member
    http://site.dragonflyaero.com

  2. #2

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    Interesting, Thank you. Have you done other research on the 6.8 SPC ???

    Any testing with heavier than 115 Gr. ???

    I have a 6.8 SPC pistol (10 1/2" AR-15) I want to wring-out soon.

  3. #3

    Default

    Sorry: found the post on the 130 Gr. and 150 Gr.

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