300 Blackout vs 5.56

Discussion in 'AR Talk' started by louslugger15, Mar 13, 2012.

  1. louslugger15

    louslugger15 XDTalk Newbie

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    If you don't plan on suppressing what is the main difference between the two? Is it worth to build just a 300 blackout because the price of uppers seems to bee much higher than a standard 5.56
     
  2. mbrando

    mbrando XDTalk 100 Member

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    Hi,

    Its basically a 7.62x39 size round aka ak47 but uses a standard .223 case with a .308 bullet. Depends on your Point of Use.

    - Mike
     
  3. brennahm

    brennahm XDTalk 100 Member

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    I'll get one so that my AR is legal for hunting. Has to be .25 cal or bigger for large game in some states like mine...
     
  4. John A.

    John A. XDTalk 2K Member

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    Your hunting laws suck. By default, you're already prohibited from using some of the fastest, flattest shooting, good penetrating hunting calibers out there.

    223
    22-250
    243
    6mm

    Just because the bullet is bigger around, doesn't automatically make it (or the hunter) "better".

    louslugger, what are you planning on hunting with it? And at what normal distances would you be hunting at? That would help us be able to make better recommendations.
     
  5. 1xdmshooter

    1xdmshooter XDTalk 500 Member

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    +1 What are you wanting to hunt?
     
  6. louslugger15

    louslugger15 XDTalk Newbie

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    I'm actually not using the rifle for hunting. My question is does the 300 blackout make a better all around rifle than 5.56? By this I mean home defense, range time, and i guess the occasional hunting trip if the heart desired. Is the higher price warranted? Or will this round become nonexistent in 2-3 years?
     
  7. Shaniac

    Shaniac XDTalk 1K Member

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    Here are the differences:

    5.56x45 (.223 Rem)

    • super sonic round
    • Ballistics data
      • 55gr: Velocity = 3,240 ft/s Energy = 1,282 ft-lb
      • 62gr: Velocity = 3,100 ft/s Energy = 1,303 ft-lb
      • 69gr: Velocity = 2,950 ft/s Energy = 1,333 ft-lb
      • 77gr: Velocity = 2,750 ft/s Energy = 1,293 ft-lb

    7.62x35 (.300 BLK)

    • both super sonic and sub sonic rounds (sub sonic ideal for use with a suppressor)
    • Ballistics data
      • 125gr: Velocity = 2,215 ft/s Energy = 1,360 ft-lb
      • 220gr: Velocity = 1,010 ft/s Energy = 498 ft-lb


    Basically the 5.56 will give you more accuracy at greater distances than the .300 BLK however the .300 BLK will outperform the 5.56 in close quarters due to the heavier grain.
    the energy between the 66gr .223 REM and the 125gr .300 BLK are marginally different but when you take in consideration that the bullet grain of the .300 BLK is much larger, this will inflict more damage at closer ranges.



    Now, I am not knocking the 5.56 (.223) by any means...although this round is scrutinized by its small size, it remains an effective round as the military/NATO has used it since the 1960's.



    It all boils down to variety since the AR-15 is already a modular rifle...if you have the money to have an AR for both rounds then go for it...what makes the .300 BLK so nice is that all you would need to do is purchase an upper with a .300 barrel; the BCG, Upper and magazine for the 5.56 will work hand in hand with this round. :cool:
     
  8. brennahm

    brennahm XDTalk 100 Member

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    The law only applies to big game. I believe there's a spec for energy as well. And CO is very protective in many ways of our natural resources, they don't want some ******* coming in and hunting elk with his .17 hmr.
     
  9. John A.

    John A. XDTalk 2K Member

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    Do they allow bow hunting big game?

    I can almost gaurantee a bow doesn't have as much velocity/energy as many rifles.

    I'm not disagree'ing with you that there are just things I wouldn't use to hunt big game with (especially really big game like elk), but just because someone has a law doesn't mean that it is logical or correct.
     
  10. slugger6

    slugger6 XDTalk 85K Member Founding Member

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    A profound statement, indeed!
     
  11. agalindo

    agalindo XDTalk 15K Member Founding Member

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    Actually all you need to purchase is a .300 blk barrel. The upper, lower, mags and bcg are the same.

    The .300 does better on medium game at a distance because of the heaver bullet.
     
  12. bobbo65

    bobbo65 XDTalk Member

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    Better barrier penetration too. I just ordered one for my MRP chassis last weekend.
     
  13. rodan86

    rodan86 XDTalk Newbie

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    If you dont plan to suppress whats the point, and even then the blastics suck out of a 300 blk sub sonic, and there is no expanding subsonic ammo. Better off to just stay 5.56 or go to 6.8 6.5 IMO
     
  14. Shaniac

    Shaniac XDTalk 1K Member

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    Yeah but you are talking about a .30 caliber bullet verses a .22 or slightly larger in size....more mass = more damage.
    They compare the .300 BLK balistics to that of the .30–30 and most know that the .30–30 has proven itself over the years.

    Again, I'm not knocking the 5.56 (.223 REM), as I am a big fan of it myself...just like the heavier mass bullet option.... :cool:
     
  15. blackknight

    blackknight XDTalk 100 Member

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    I love my blackout, planning on adding a 556 upper closer to fall when funding opens up. As for cost, replacing the barrel will be cheaper. I opted for an upper that cost me $680(CMMG) and a plum crazy lower.
    Not to mention the pop on iron at 250yds is music to my ears
    [​IMG]
     
  16. agalindo

    agalindo XDTalk 15K Member Founding Member

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    Have you considered that they make 300blk that's supersonic? That the 300blk supersonic is almost a match to the 6.8 with the advantage of only having to change the barrel on your existing 5.56?
     
  17. AwPhuch

    AwPhuch XDTalk 15K Member

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    6.8 and 6.5 you have to modify either the mags or the BCG or a bunch of other stuff...with 330 blk...you just have to change the barrel/upper...that's it.
     
  18. bobbo65

    bobbo65 XDTalk Member

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    rsilvers has a thread on m4c where he's comparing the energy of his .300blk to 5.56. He's worked up a table showing the two side by side. Basically with the .300 you get the ft-lb equivalence of a 6" longer barrel for the 5.56. ie. a 10" .300blk 110gr barnes delivering 2173fps and 1153ft-lbs energy is comparable to a 16" XM193 3083fps and 1161ft-lbs. And a 16" .300blk delivers a slightly better punch than 5.56 from a 24" barrel!

    Here's a link for those interested in seeing the full table: 300 BLK vs 5.56mm for barrel length efficiency - M4Carbine.net Forums
     
  19. John A.

    John A. XDTalk 2K Member

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    The only way to truly compare the two is to compare them as equally as possible.

    Rsilvers of course has pushed the AAC because he is the person in charge of it, so naturally, he wants to succeed and the round to succeed.

    But numerous people from all over the internet have called BS on many half truths and assumptions and comparisons that are anything but fair comparisons.

    I'm not saying the round is altogether bad, but some of what I have seen leaves me shaking my head.

    Yes, the whisper has a bigger bullet than 5.56 and it can be loaded to subsonic so it's quieter, but "better" is relative

    It is more of a niche round more for quiet close quarters. Even though their site says they may can be made to shoot out to 440 meters, I would wonder what the terminal ballistics and penetration would be at those distances.

    The max distance they quote on their site alone already eliminates it from the 500 meter qualifying line in the service.

    Supersonic blackout bullets are among the slowest commercial 30 caliber bullets out there because they're so restricted by case capacity.
     
  20. UofHdevildog

    UofHdevildog XDTalk 5K Member

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    Well that leaves me out.
     

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