Meet the Army's new .300 Winchester Magnum sniper rifle - Page 2

Meet the Army's new .300 Winchester Magnum sniper rifle

This is a discussion on Meet the Army's new .300 Winchester Magnum sniper rifle within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; Is this a specially manufactured projectile as Sierra lists the 220gr, MK, HPBT BC at 0.629 above 2100 fps, not 0.711. My 300 H&H will ...

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Thread: Meet the Army's new .300 Winchester Magnum sniper rifle

  1. #16
    VIP Member Array Guantes's Avatar
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    Is this a specially manufactured projectile as Sierra lists the 220gr, MK, HPBT BC at 0.629 above 2100 fps, not 0.711.

    My 300 H&H will push equivalent heavy bullets to velocities equal to the 300 Win Mag velocities on around 3 gr less powder


  2. #17
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    Is this a specially manufactured projectile as Sierra lists the 220gr, MK, HPBT BC at 0.629 above 2100 fps, not 0.711.
    It may be that the BC changes as the speed changes.
    This is the bullet that I use for shooting suppressed .300 Whisper rifles and the BC at subsonic speeds is different than that of supersonic.
    I would rather stand against the cannons of the wicked than against the prayers of the righteous.


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  3. #18
    VIP Member Array Guantes's Avatar
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    Possibly, but Sierra lists that BC for any velocity above 2100. Here is their listing.

    http://www.sierrabullets.com/index.c...0&bullettype=0

  4. #19
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    You are correct.

    Its lists it at:

    .629 @ 2100 fps and above
    .624 between 2100 and 1700 fps
    .608 @ 1700 fps and below

    If you take a look at the chart for the 240, it lists the BC at .711 for 2150 and above, which would be closer to the posted BC.

    Perhaps they posted it in error.
    I would rather stand against the cannons of the wicked than against the prayers of the righteous.


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  5. #20
    VIP Member Array Guantes's Avatar
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    Could be, it just got me curious.

  6. #21
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    Not many people would pick up on that.
    Now, I'm wondering about you.
    I would rather stand against the cannons of the wicked than against the prayers of the righteous.


    AR. CHL Instr. 07/02 FFL
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  7. #22
    VIP Member Array Guantes's Avatar
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    Moi? I just pay attention to details.

  8. #23
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    I would rather stand against the cannons of the wicked than against the prayers of the righteous.


    AR. CHL Instr. 07/02 FFL
    Like custom guns and stuff? Check this out...
    http://bobbailey1959.wordpress.com/

  9. #24
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    Quote Originally Posted by Guantes View Post
    Is this a specially manufactured projectile as Sierra lists the 220gr, MK, HPBT BC at 0.629 above 2100 fps, not 0.711.
    Yep, absolutely correct, my error... I quoted the value for the 240 grain Match King. Dang, just a 50% improvement in BC.
    Smitty
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  10. #25
    VIP Member Array Guantes's Avatar
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    Thank you for the correction.

  11. #26
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    Quote Originally Posted by gasmitty View Post
    Taking the view from 10,000 feet, I find it interesting that about 60 years after the US Military moved away from the .30-06 to the .308, they jumped to the .300 Win Mag. That's roughly going from the .30-06 "minus P" to the .30-06 "plus P". Admittedly, a very simplistic view.

    Note the following from Wikipedia (shown in full, Wikipedia is open-source):

    "The US government purchased MK 248 MOD 1 .300 Winchester Magnum match-grade ammunition in 2009 for use in adapted M24 Sniper Weapon Systems and other .300 Winchester Magnum sniper rifles like the US Navy Mk.13s. This ammunition was developed as a .300 Winchester Magnum Match Product Improvement (PIP) and uses the 14.26 g (220 gr) Sierra MatchKing Hollow Point Boat Tail (HPBT) very-low-drag bullet fired at a nominal muzzle velocity of 869 m/s (2,850 ft/s) 15.2 m/s (50 ft/s). According to the US Navy this ammunition should increase the maximum effective range of .300 Winchester Magnum sniper rifle systems to 1,370 m (1,500 yd), decrease wind deflection on bullets in flight and use a reduced muzzle flash propellant that remains temperature stable across an operational temperature range of -32 C to 74 C (-25 F to +165 F).[6][7][8] According to JBM Ballistics[9], using the G7 ballistic coefficient provided by Bryan Litz, the Mk 248 MOD 1 .300 Winchester Magnum cartridge, when fired at its nominal muzzle velocity of 869 m/s (2,850 ft/s), should have approximately 1,286 m (1,406 yd) supersonic range under International Standard Atmosphere conditions at sea level (air density ρ)."

    Most impressive is the ballistic coefficient of the bullet used - at 0.711 it's about a 75% improvement over the 150 & 168 grain bullets used for the .308 sniper rounds.
    You know? Posts like that really take the fun and guesswork out of using Kentucky windage.
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  12. #27
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    Quote Originally Posted by OldVet View Post
    You know? Posts like that really take the fun and guesswork out of using Kentucky windage.
    Can't help it... that's the career engineer/numbers/analytical guy in me.

    Get me away from the PC and the calculator and I'm actually a pretty decent guy to hunt or shoot with (allegedly).
    Smitty
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  13. #28
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    Quote Originally Posted by gasmitty View Post
    Taking the view from 10,000 feet, I find it interesting that about 60 years after the US Military moved away from the .30-06 to the .308, they jumped to the .300 Win Mag. That's roughly going from the .30-06 "minus P" to the .30-06 "plus P". Admittedly, a very simplistic view.
    Help me understand your comment quoted above...could I fire this bullet from my M1 Garand (I know so little about this it shows, I know)...
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  14. #29
    VIP Member Array Guantes's Avatar
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    You could fire the projectile if it was loaded in a 30-06 cartridge, but not the 300 Win Mag cartridge as it has different dimensions then the 30-06.

  15. #30
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    Quote Originally Posted by DaveJay View Post
    Help me understand your comment quoted above...could I fire this bullet from my M1 Garand (I know so little about this it shows, I know)...
    Nooooooooooooooooo!!! I was simple referring to the relative power levels. Your Garand is chambered for the .30-06, but the .300 Win Mag is derived from the .338 Win Mag and bears almost no lineage to the .30-06. While both cartridges have the same nominal overall length, the .300 Mag is distinguished by the "belt" just above the rim, a longer case length, and a sharper shoulder angle. I sincerely doubt the .300 Mag could even chamber in the Garand, but please don't try it to find out.

    Sorry if I misled you.
    Smitty
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