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Ss109

Discussion in 'The Powder Keg' started by Klaus, May 25, 2002.

  1. Klaus

    Klaus G&G Newbie

    Anyone know a good link covering the terminal ballistics of the NATO spec Ss109 5.56 ammo? I am trying to find out penetration in various materials, deflection, yawing, etc..
     
  2. BattleRifleG3

    BattleRifleG3 G&G Evangelist

    Next time I go to my friend's range I'll chrony some SS109 from a Mini-14.
     

  3. Klaus

    Klaus G&G Newbie

    I do not need exterior ballistics, I need terminal ballistics. I have no trouble finding data on velocity or trajectory; it is what happens on impact that I am interested in.
     
  4. Klaus,
    Soldier Of Fortune Mag. did an article on terminal ballistics of 223 ammo last year. This is thier web sight maybe they can dig the article up for you. I'll keep looking through my back issues and see if I can find it.
    http://www.sofmag.com/
     
  5. MikeC

    MikeC G&G Newbie

    96
    0
    Klaus, not sure if what you want is included but on AR15.com they have an ammo FAQ. They cover the differences between M193 and SS109. It's in the Ammo forum. HTH
     
  6. Logansdad

    Logansdad Guest

    shamelessly stolen from http://www.ak-47.net/ammo/ss109.txt

    "NATO specifications for SS109 (U.S. M855) Ball require a 61.7 grain
    (q 1.5 grains) with a hardened steel penetrator at a velocity of 3,025 fps
    (q 40 fps) from a 20 inch barrel 25 meters from the muzzle. Typical
    velocity 15 feet from the M16A2's muzzle is around 3,100 fps. The accuracy
    requirement from a test fixture equates to a maximum of approximately four
    MOA over the 100 to 600 yard range. Typical accuracy of average lots in an
    M16A2 is about 2+ MOA. This round must also penetrate a nominal 10 gauge
    SAE 1010 or 1020 steel test plate at a range of at least 570 meters (623
    yards). The M193 round will penetrate this same plate reliably at 400
    yards, and about half the time at 500 yards. The 5.56mm and 7.62mm NATO
    rounds will penetrate it reliably out to 700 yards or more. Nominal
    ballistics for M193 and M855 Ball rounds are given in an accompanying
    table. The tables were constructed from the latest data supplied by the
    U.S. Army Ballistic Research Laboratory at Aberdeen Proving Ground,
    Maryland.
    5.56 NATO Ball Ammunition Ballistic Comparison
    based on Aberdeen Proving Ground Data
    velocity (fps) trajectory (in.) drop (inches) drift (inches)*
    range M193 M855 M193 M855 M193 M855 M193 M855
    (meters)
    0 3,200 3,100 -2.5 -2.5 0.0 0.0 0.0 0.0
    100 2,774 2,751 +2.8 +4.4 -2.2 -2.3 1.3 1.1
    200 2,374 2,420 +2.7 +5.8 -9.9 -10.2 5.8 4.9
    300 2,012 2,115 -4.9 0.0 -25.1 -25.3 14.2 11.8
    400 1,680 1,833 -23.0 -15.0 -50.8 -49.5 27.6 22.4
    500 1,373 1,569 -56.2 -42.9 -91.6 -86.7 47.5 38.0
    600 1,106 1,323 -113.1 -88.2 -156.1 -141.3 76.4 59.5
    700 995 1,106 -206.8 -156.1 -257.3 -220.9 113.5 88.4
    800 927 1,010 -339.9 -267.7 -398.0 -339.2 156.1 124.9

    * Drift for 10 mph wind.
    M193 Ball ammunition fired in M16A1 rifle with 250 meter battle sight zero.
    M855 Ball ammunition fired in M16A2 rifle with 300 meter battle sight zero.
    ____________________________________________________________________________

    5.56mm Velocities and Accuracy

    ammunition
    55 grain Ball bullets
    U.S. M193 "TW 73"
    Lot TW-2-699
    PMC M193
    "PS 80"
    Lot PS-E5-2139-79

    Because the steel penetrator increases the length and changes the
    weight distribution of the SS109 bullet, it is suitable for use only in
    barrels with a twist of one turn in nine inches or faster. Pre-1986 Ruger
    Mini-14's with the one in 10 inch twist will handle this round but
    stability is marginal and accuracy falls off below zero degrees Fahrenheit.
    Military rifles intended to use this ammunition have a seven inch twist to
    ensure bullet stability under arctic conditions and to stabilize the even
    longer L110 and M856 tracer bullets. Current production Mini-14's and some
    Ranch Rifles now have seven inch twists.

    To set the baseline for testing, U.S. M193 Ball was fired from both an
    AR-15 (12 inch twist) and an AR-15-A2 HBAR (seven inch twist), to establish
    velocity and accuracy standards. No M855 was available, as that ammunition
    is restricted to U.S. government agencies.

    The Hirtenberger SC ammunition tested in the AR-15-A2 came from an
    initial lot supplied by Hansen Cartridge Corporation. It is suitable for
    nine inch or faster twist barrels, and was included for comparison.

    The IMI 223-13CL 63 grain softpoint load was included in the tests
    since it is currently the only 5.56mm round with a heavy bullet readily
    available. While it is usable in twelve inch twist barrels because of the
    bullet's flat base and short overall length, it is sure to find favor among
    owners of AR-15-A2's.

    Paramilitary 5.56mm ammunition should not be fired in commercial
    rifles with chambers reamed to SAAMI specifications. The SAAMI chamber used
    in sporting firearms has a smaller diameter bullet seat, a shorter throat
    and less free bore than military chambers. Chamber pressures can rise
    dramatically when military ammunition is fired in them.

    SAAMI specifications for commercial .223 ammunition specify an average
    chamber pressure of 52,000 CUP. When military ammunition is fired in the
    SAAMI chamber, pressures may rise to 55,000 or 60,000 CUP!

    U.S. manufactured paramilitary ammunition intended for civilian
    consumption is purposely loaded down to SAAMI pressure levels and bullets
    are often seated deeper to accommodate the SAAMI chamber. Ammunition
    certified to meet Mil-C-9963F (the military specification for M193 Ball) is
    only available to U.S. government agencies and private security firms under
    contract to provide security for U.S. government installations.

    Imported ammunition of that type is generally loaded to standard
    military levels and should be fired only in firearms with military
    dimensioned chambers. To the author's knowledge, the only U.S. manufactured
    commercial firearms with military chambers are the Colt AR-15 series, the
    Ruger Mini-14 and Ruger No. 1 rifles manufactured since 1986.
     
  7. NRAJOE

    NRAJOE YOU TALKIN' TO ME!? Forum Contributor

  8. Logansdad

    Logansdad Guest

    I did a search on Dogpile and found this thread..it needed resurrection :guitar: :gangster:
     
  9. NRAJOE

    NRAJOE YOU TALKIN' TO ME!? Forum Contributor

    :insane: :nod:
     
  10. Otter

    Otter G&G Newbie

    ammo-oracle.com has everything on 5.56x45, the early AR-15 like the Colt SP1 has a 1:12 twist which likes the 55gr M193 ball round, the heavier 62gr ball (SS109 & M855) require more twist to stabilize the bullet.