300 AAC Blackout AKA 7.62x35mm
Results 1 to 7 of 7

Thread: 300 AAC Blackout AKA 7.62x35mm

  1. #1
    Rifleman Cruzzer's Avatar
    Join Date
    Jan 2008
    Posts
    119

    300 AAC Blackout AKA 7.62x35mm

    Okay folks what to you think?

    From what I've read today an XCR would be an absolute idea platform for this cartridge.

    Since its inception as the standard US military primary issue rifle ammunition the 5.56x45mm NATO round has run up against firm opposition from those who argue that the 30 caliber round provides the minimum, if not ideal, performance necessary for the modern battlefield soldier. While 5.56mm NATO has enjoyed wide-spread acceptance in military circles, the fluid nature of the missions that some special operations groups encounter often demand a round that not only provides better performance[1] in the high energy standard velocity rounds but also one that can offer subsonic performance greater than the current standard 9mm sub-machine guns now in use.[2]

    In an effort to satisfy this need the 300 AAC Blackout (whose existence was first made public by an article in Military Times.)[3] was created by Advanced Armament Corp. in cooperation with Remington Defense, under the direction of AAC's Research and Development Director Robert Silvers.

    Project goals were:

    * Create a reliable compact 30-cal solution for AR platform
    * Utilize existing inventory magazines while retaining their full capacity
    * Create the optimal platform for sound and flash suppressed fire
    * Create compatible supersonic ammo that matches 7.62x39mm ballistics
    * Provide the ability to penetrate barriers with high-mass projectiles
    * Provide all capabilities in a lightweight, durable, low recoiling package

    Meeting these goals allowed the development team to negate many of the perceived drawbacks inherent to other large caliber cartridges when used in the M4 platform. Colt Firearms and other arms makers had previously chambered AR pattern rifles and carbines in various 30 caliber rounds but several issues were encountered. In the case of the 7.62x39, its relatively severe case angle caused feeding issues[4] unless specially modified AK47 magazines were used and even then results were less than outstanding. Modified bolts were also needed owing to its larger case head diameter. Rounds such as the 6.8spc and 6.5 Grendel had similar part-interchangeability issues but did allow for the use of the standard M4/M16 30 round magazine albeit with a reduced capacity.

    Wildcats such as the 300 Whisper and 300-221 addressed these issues but their wide spread use in single shot handguns along with the lack of an industry standard cartridge dimension meant that a great number of the popular loads on both the supersonic and subsonic end of the spectrum were less than ideal in the AR pattern weapons. Many of these rounds required an excessively long overall cartridge length that would prohibit feeding in a STANAG magazine while using powder charges that were not compatible with the pressure requirements of the M4 carbine. This was particularly noticeable when using subsonic ammunition in conjunction with a silencer as short stroking and excessive fouling would occur siliar to that which was seen in the earliest variants of the M16 in Vietnam.[5]

    By keeping the M4 in mind as the primary host during load development the designers were able to work up a host of cartridges that would satisfy not only the ballistic requirements set forth but also ensure mechanical reliability with the fewest changes to the weapon itself with only a simple barrel change being necessary for a complete conversion.

    300 AAC BLACKOUT was approved by SAAMI on January 17th, 2011.

    Component brass was distributed on March 4nd, 2011.

    Performance
    Barrel Cartridge Velocity Force
    9 inch barrel 300 AAC Blackout, 123 gr MC 2130 ft/s 1238 ft-lb
    16 inch barrel 300 AAC Blackout, 123 gr MC 2280 ft/s 1420 ft-lb

    http://en.wikipedia.org/wiki/300_AAC...287.62x35mm%29

    300 AAC BLACKOUT offers approximately 25% more energy from a 9 inch barrel than 5.56mm
    M855 - with much less powder and resulting muzzle blast. Barrel life expectancy is longer, and
    it has the additional benefit of the availability of high-mass subsonic ammunition for quieter use
    with a sound suppressor and which provides 115% more energy than an MP5-SD at the muzzle
    and 165% more at 200 meters. The overall SPL of 126 dB is a full 4 dB quieter than the subgun.**

    http://300aacblackout.com/resources/...pper-Oct18.pdf

    From what I've discovered the 5.56 bolt face will work with this round as well as the magazines all we'd need is a barrel. Remington is already making the ammo, reloading dies are out there as well. Noveske, Wilson Combat and of course AAC are all making rifles or uppers.

    Now here is my question. Does anyone know who can re-chamber an XCR 7.63x39 barrel to accommodate 300 Blackout or does anyone have any good ideas on how to accomplish this?

    Alright folks let the replies begin. ;D
    "I get knocked down but I get up again, they're never going to keep me down!"

  2. #2
    XCR Guru BuddyChryst's Avatar
    Join Date
    Apr 2010
    Location
    MI
    Posts
    1,515

    Re: 300 AAC Blackout AKA 7.62x35mm

    Use the search function from the home page and you should be able to find a discussion or two

    But you'd need a 5.56 heavy to ream. The 7.62x39 would have too big of a chamber.
    Charter member of the vast, right-wing conspiracy

  3. #3
    Rifleman Cruzzer's Avatar
    Join Date
    Jan 2008
    Posts
    119

    Re: 300 AAC Blackout AKA 7.62x35mm

    Thanks Buddy.
    "I get knocked down but I get up again, they're never going to keep me down!"

  4. Remove Advertisements
    XCRForum.com
    Advertisements
     

  5. #4
    XCR Guru aziator's Avatar
    Join Date
    Oct 2007
    Location
    Southern AZ
    Posts
    6,835

    Re: 300 AAC Blackout AKA 7.62x35mm

    I have a 5.56 heavy that I got specifically to cut down. I also have two 9" 5.56 barrels so I think I will try and use one of them to have re-cut for 300BLK. If I do it I will be deployed when it is cut so it would be a while until I had a chance to shoot it.
    Don't confuse enthusiasm for competence

    Want more grip for your M&P Pistol? Send me a message.

  6. #5
    Expert cjt50's Avatar
    Join Date
    Jun 2010
    Location
    Tampa Bay
    Posts
    772

    Re: 300 AAC Blackout AKA 7.62x35mm

    Just curious, who would you recommend sending it to for rechambering and rifling? I have a heavy barrel 223 laying around and might consider doing it once ammo hits the streets
    "Tis better to be silent and be thought a fool, than to speak and remove all doubt." - Pres. A. Lincoln

  7. #6
    XCR Guru aziator's Avatar
    Join Date
    Oct 2007
    Location
    Southern AZ
    Posts
    6,835

    Re: 300 AAC Blackout AKA 7.62x35mm

    Quote Originally Posted by cjt50 View Post
    Just curious, who would you recommend sending it to for rechambering and rifling? I have a heavy barrel 223 laying around and might consider doing it once ammo hits the streets
    Not sure, I ran into a couple dead ends and gave up for now, too close to deployment to worry about it. If you find out let me know.
    Don't confuse enthusiasm for competence

    Want more grip for your M&P Pistol? Send me a message.

  8. #7
    Expert cjt50's Avatar
    Join Date
    Jun 2010
    Location
    Tampa Bay
    Posts
    772

    Re: 300 AAC Blackout AKA 7.62x35mm

    You got it,

    Stay safe!!
    "Tis better to be silent and be thought a fool, than to speak and remove all doubt." - Pres. A. Lincoln

Sponsors

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. 300 AAC Blackout XCR
    By Devil doc in forum Robinson Armament
    Replies: 310
    Last Post: 01-26-2015, 11:33 AM
  2. .300 Blackout
    By WonderHorse in forum Other Calibers
    Replies: 78
    Last Post: 04-28-2014, 12:33 AM
  3. Standard XCR with a 12 inch 300 blackout barrel
    By Devil doc in forum General Discussion
    Replies: 12
    Last Post: 03-20-2012, 11:10 PM
  4. 300AAC Blackout
    By SDDuc996 in forum General Discussion
    Replies: 140
    Last Post: 12-03-2010, 06:24 PM

Search tags for this page

300 aac blackout (7.62x35mm)
,

300 aac blackout (7.62x35mm) ?

,
300 blackout and 7.63x39
,
7.62x35mm ammo
,
life expectancy on a aac 300 upper
,
rechamber 300 blackout to 7.62x39
,
rechamber 300 whisper to 300 blackout
Click on a term to search for related topics.