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Thread: Federal 6.8 SPC ammo specific revealed.

  1. #1
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    Federal 6.8 SPC ammo specific revealed.

    Average muzzle velocity for this load from the 8.5-inch barrel measured a respectable 2450 fps. In doing so, this load generates 1199 foot-pounds of energy at the muzzle. Firing the same load from a 16-inch barrel produces 2900 fps and 1680 foot-pounds.

    Taking barrel length to 24 inches increased velocity to 3050 fps and energy to 1858 foot-pounds. Testing in extreme temperatures showed velocity to average 2275 fps at -29 degrees F and 2475 fps at 125 degrees F from the 8.5-inch barrel. When fired from a 24-inch test barrel, ATK recorded a group measuring 1.56 inches at 200 yards.
    Source

    At 1200 ft lbs for the 8.5", it basically performs like XM193 does out of a 20".

    Its basically within a SSA tactical load, which a certain internet troll thinks is dangerous and no way would Federal loads reach that.

  2. #2
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    Here's a pretty good chart from TOS for velocity and barrel length:

    http://www.ar15.com/forums/t_3_121/5...udes_6_5_.html
    Last edited by FlyingHunter; 11-14-12 at 23:15. Reason: sentence structure
    Politician's Prefer Unarmed Peasants

  3. #3
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    Quote Originally Posted by Freedoooom View Post
    Source

    At 1200 ft lbs for the 8.5", it basically performs like XM193 does out of a 20".

    Its basically within a SSA tactical load, which a certain internet troll thinks is dangerous and no way would Federal loads reach that.
    Tempting. However, I probably won't take the 6.8 plunge until I can get a source of free brass.
    Insert impressive resume here.

  4. #4
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    I've had good luck and consistent availability of brass and loaded ammo from Silver State Armory.

    Brass here:

    http://www.ssarmory.com/6.8mm_SPC.aspx
    Politician's Prefer Unarmed Peasants

  5. #5
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    2900 is the expected number from a 16" tube.

    Looking forward to this ammo.
    Black River Tactical
    BRT Covert Comp Flash Hiders 7.62 & 5.56
    BRT MicroPin Gas Blocks
    BRT MarkBlue Gas Tubes
    BRT CustomTune Gas Ports
    BRT MicroTune Gas Blocks

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    It was my understanding that the new LWRCI UCIW Six8 ammo wouldn't fit into a standard AR15 magazine well.

    That was why they made a totally new lower for it.


  7. #7
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    Quote Originally Posted by Snipe315 View Post
    It was my understanding that the new LWRCI UCIW Six8 ammo wouldn't fit into a standard AR15 magazine well.

    That was why they made a totally new lower for it.

    The problem is with all 6.8 ammo, not just the Federal UCIW Six8 ammo. 6.8 magazines generally aren't very reliable due to the larger case diameter, and they are only 20-25 rounds. The LWRC lower accepts a proprietary magazine, designed by Magpul, that features an optimized double stack configuration, but it won't fit in a standard AR15 magazine well.
    --Nick
    VP of Business Development for SilencerCo

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