General Dynamics NGSW 6.8mm US Army Prototype Live Fire with plastic case ammo

Discussion in 'Rifle Country' started by someguy2800, Jul 16, 2021.

  1. someguy2800

    someguy2800 Member

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  2. MechAg94

    MechAg94 Member

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    It looks interesting. The velocity with the heavier projectile is impressive.

    The footage with the M240 has me hopeful this could make it to the civilian market.

    I also like that the requirements have the suppressor included.
     
  3. NIGHTLORD40K

    NIGHTLORD40K Member

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    That smoke at 1:05 doe....still think there may be heat energy transfer issues with the plastic cases.
     
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  4. twarr1

    twarr1 Member

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    And it's ambidextrous on both sides!
     
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  5. Boomholzer

    Boomholzer Member

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    6.8x51mm. Ha. Is this a M4 replacement or more of a SPR?
     
  6. Jim Watson

    Jim Watson Member

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    The original intention was for a SAW-LMG but it quickly gained a companion rifle.
     
  7. C-grunt

    C-grunt Member

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    From what Ive heard from people in the industry is that the True Velocity ammo is doing very well in the testing along with the Sig ammo. Sig's ammo is just a beefed up 308 case necked down to 6.8 and runs at a really high chamber pressure. I believe their ammo pushes a 130 grain bullet at 3000 FPS from a 16inch barrel.
     
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  8. jmorris

    jmorris Member

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    The “if” at 2:29 is a fairly large one, others have tried and failed before. I wish them luck, could reduce costs for us down the road.
     
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  9. someguy2800

    someguy2800 Member

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    This is the first one that I have seen where they actually designed a case to be made from plastic rather than trying to make a 308 or 223 case out of plastic. If they can get the case head integrity down, which it looks like they have, and can design an extractor and rim that can extract in extreme conditions then I think they will have it licked.
     
  10. jmorris

    jmorris Member

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    From the plastic cased ammunition I have used they seem to have had the same experience I had.

    BB656504-EEC6-491B-A27B-3AC79C00B377.jpeg

    and tackled that problem by eliminating the neck.

    52591860-7DDE-4849-82F1-E03544310B98.jpeg

    I didn’t watch the entire video, did they show a cut away of the plastic case or just a projectile?

    Neck tension was another issue with the stuff I had.
     
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  11. Boomholzer

    Boomholzer Member

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    the video showed plastic cases with neck around 0:47 in and the one above ^^
     
    Last edited: Jul 16, 2021
  12. mcb

    mcb Member

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  13. MechAg94

    MechAg94 Member

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    I didn't see a cutaway, but he did mention they said polymer allowed them to alter the internal geometry of the casing in ways they can't do with brass. I got the impression it was for powder burn issues, not strength, but you never know.

    He mentioned they used a brass washer between primer and case to protect the plastic. I can't think why that would be an issue unless they planned to reload.
     
  14. Jim Watson

    Jim Watson Member

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    They specifically say it is not meant to be reloadable.

    Previous work on plastic cases for standard chambers like the AII Neckless had reduced volume such that they had to go down to a 130 gr .308 to keep the velocity and trajectory up.
     
  15. bfoosh006

    bfoosh006 Member

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    Youch... that trigger pull looks horrible.... and I have to say, it looks like it would be exhausting to use !

    Plastic cases have come a LONG way since first considered. To me, it looks like True Velocity has worked out a lot of the previous bugs.
     
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  16. Double Naught Spy

    Double Naught Spy Sus Venator

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    Did he really just say/infer that they can compensate for the potentially less accurate barrel (because it is moving around) by high velocity ammo??? How does that work? My understanding is that would give you really fast less accurate shots down range.
     
  17. jmorris

    jmorris Member

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    Works to a point in some gun games. :)

    FWIW there are accuracy standards that must be met along with reliability ones, the “spec” part of “MIL-SPEC”. At least until they decide thats not fair to things that suck and they eliminate them in the name of equity. ;)

    To be fair, my well used 1919 (floating barrel) with an optic on it is more accurate than some bolt action rifles I have come across. Part of the problem with qualitative statements like “less accurate”, what does that mean in inches of difference at 600 meters?
     
    Last edited: Jul 17, 2021
  18. Boomholzer

    Boomholzer Member

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    Reminded me of the M1941 Johnson Rifle
     
  19. Double Naught Spy

    Double Naught Spy Sus Venator

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    I fully understand that some rifles with barrels that move can be accurate. I understand some barrel with stationary barrels aren't that accurate. That has nothing to do with the statement that they could help remedy issues of barrel motion inaccuracy with increased velocity.

    Yes, standards have to be met. They are expecting to pair this rifle and ammo with an electro optic sighting system that will allow for 600 yard shots (IIRC).
     
  20. C-grunt

    C-grunt Member

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    You gotta remember this dude is a journalist.
     
  21. Hartkopf

    Hartkopf Member

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    I was completely skeptical about plastic cased ammo until I watched the video and he mentioned the case internals can be shaped in a way to increase velocity. Supposedly +200fps. And the heat insulation properties uses less powder. And of course the weight savings is good. If they get it right then it all adds up to a good step forward. But I’m still a bit skeptical. If these guns aren’t 99.999% reliable or the ammo doesn’t age well or it’s delicate and cracks in shipping...... Hopefully they work out ALL the bugs and think of ALL the potential problems.
     
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