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Thread: 300 AAC vs. 7.62X39

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    300 AAC vs. 7.62X39

    The 7.62X39 seems to be within about 5% power wise of the 300 AAC. With all of the options available in the market when it comes to 7.62X39, is it ever going to be worth going over to the 300 AAC? Is there something magic about the 300 AAC?

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    To me, it seems the "magic" of the 300 blackout round is that you get a .30 caliber round out of your AR, and all you need is a new barrel. Existing BCG, magazines, etc. already work, for a round that (again, from what I have READ) is supposed to improve CQB lethality of the AR platform.

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    Quote Originally Posted by dolf View Post
    With all of the options available in the market when it comes to 7.62X39, is it ever going to be worth going over to the 300 AAC?
    Do you want an AK or AR? The answer to my question should answer your question.

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    I like the .30 cal round , and I've got a Colt 7.62X39 upper. I was just wondering about the 300 AAC.

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    There are issues feeding the 7.62x39 round into an AR upper. The 300 BLK does not have these issues, can be used with only a barrel swap, and is SAAMI standardized.
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    Quote Originally Posted by dolf View Post
    I like the .30 cal round , and I've got a Colt 7.62X39 upper. I was just wondering about the 300 AAC.
    In terms of power they are similar.

    The advantage of the 300 BLK is:
    - Developed for the AR system- in terms of fit and cycling
    - Factory ammo fits 30 rounds in standard 30-round 5.56 mags with no mods (including GI mags, PMags, etc)
    - Case head the same as 5.56, taper the same as 5.56 (not as angled as 762x39)
    - Uses a standard 5.56 AR bolt, carrier, etc
    - ONLY change needed to a 5.56 gun is the barrel

    Plus, the 300 BLK uses .308 caliber bullets which makes variety and availability very good for reloaders, unlike with 762x39.

    And part of the development for 300 BLK included reliable and safe subsonic options for real quiet suppressed operation. That is another nice option.
    Last edited by JasonM; 03-01-11 at 15:17.

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    Todd from Noveske choreographed the 123 grain Remington ammo as 2345 fps from a 16 inch Noveske barrel. One of our customers got 2360 average from an AAC Model-7 barrel. Both of these are higher than what Remington claims - but we wanted to publish a spec that was conservative and was easily made by the shipping product.

    7.62x39mm, averaging some data I saw posted around the interweb, is about 2250 fps from a 16 inch barrel. I know the spec for 7.62x39 is supposed to be faster than that, but it seems to be loaded mildly in practice.
    Last edited by rsilvers; 03-01-11 at 21:55.

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    Where the 7.62x39 wins is available ammunition, and price of ammo. If you've seen a PWS Diablo in 7.62x39 run in F/A then you know feeding issues can be resolved. When loaded brass cased ammunition comes down to $0.30/rd I'll throw my x39 barrels out the window and get 2 blackout barrels to replace it. Until then, I'll happily enjoy shooting my 7.62x39 uppers for $5.00/20rds in brass cases
    30 caliber junkie.

    God Bless America.

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    Quote Originally Posted by rsilvers View Post
    Come on, now.
    http://gun-deals.com/ammo.php?caliber=7.62x39

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    I recall seeing numerous cases of 762x39 at $200-220 at the last Chantilly gun show.

    Don't get me wrong- 300AAC looks like a promising round and I'd love to have one but you need massive economies of scale to make a round affordable to shoot. 762x39, 9mm, 5.56, 22LR, etc. It's a bit of a chicken vs egg paradox
    Last edited by Boss Hogg; 03-03-11 at 22:38.

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    Quote Originally Posted by rsilvers View Post
    The Yugo brass cased corrosive stuff is about 15 to 20 cents a round based on that site.
    formerly known as "eguns-com"
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    http://www.eguns.com/www.eguns.com/Closeouts.html
    "eguns.com" domain name for sale (not the webstore). Serious enquiries only.

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    Neat site. Basically it is telling me that 223 or 5.56mm I would buy begins at 31 cents a round. It also has 300 Whisper(R):

    http://www.ammoengine.com/find/ammo/.300_Whisper
    Last edited by rsilvers; 03-04-11 at 07:40.

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    Quote Originally Posted by Boss Hogg View Post
    I recall seeing numerous cases of 762x39 at $200-220 at the last Chantilly gun show.
    Not non-corrosive brass cased.

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    what is this, dances with bullets?

    Quote Originally Posted by rsilvers View Post
    Todd from Noveske choreographed the 123 grain Remington ammo as 2345 fps from a 16 inch Noveske barrel. One of our customers got 2360 average from an AAC Model-7 barrel. Both of these are higher than what Remington claims - but we wanted to publish a spec that was conservative and was easily made by the shipping product.

    7.62x39mm, averaging some data I saw posted around the interweb, is about 2250 fps from a 16 inch barrel. I know the spec for 7.62x39 is supposed to be faster than that, but it seems to be loaded mildly in practice.

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    Instead of fighting over who can find the cheapest 7.62x39, why don't we concentrate on the 300AAC. Sounds like a great cartridge. Now if we can just find some affordable ammo, maybe some MFG's will start to produce some uppers (BCM).

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    Yugo Milsurp M67. $3.29/15rds.

    I really love the idea of the 300BLK and will be building an upper in it....someday.....
    Last edited by LMTRocks; 03-04-11 at 17:26.
    30 caliber junkie.

    God Bless America.

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    To me the attraction is also a simple barrel replacement.
    Same bolt, same mags without loss of capacity.

    The down side is the ammo price.
    But, for me it's something I would use with a short barrel in a HD scenario. I wouldn't be shooting paper with it on a regular basis.
    Last edited by shadow65; 03-04-11 at 19:39.
    Independent Field Testing/R & D

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