5.56 NATO vs 300 Blackout
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Old 05-14-2014, 02:02 AM   #1
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Default 5.56 NATO vs 300 Blackout

Hey guys. So I now have my lower and my stripped upper. I'm indecisive on wether I should chamber my build in 5.56 or 300 blackout. The rifle will be for hunting/protection/long distance target shooting. Which round is more versatile in those fields of shooting? Thanks
-Keith

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Old 05-14-2014, 02:12 AM   #2
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For anything more than 150-200 yds I'd go with the 556. The blackout carries higher energy and is much quieter(especially suppressed) but its $.70+ a round also. The blackout also shines in short(down to 8") barrels, and really doesn't have any pluses in a longer barrel. Its powder burn is complete at 8". The subsonic heavy rounds are great (208 grain Horndays), lots of energy at 100 yds, but run out of steam quickly. The lighter supersonic rounds (110-125 grains) are ok, but not great compared to a purpose designed supersonic. (6.8 SPC, 6.5 Grendle)

My 5.56 varmiters shoot 500 yds accurately and do is for $0.35 a round, with varmit/target handloads. I do have a 300 blk based pistol, so I have hands on experience with both calibers. My own choice of a longer range hog hunting AR is the 6.8 spc. The 6.5 grendle or the 6x45 wildcat are my first choices in a long range "pure" varmiter...

The nice thing is that if you change your mind later all you need is a new barrel. The 6.8 and 6.5 conversions are a little more involved(barrel, bolt head and mags)...

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Old 05-14-2014, 02:44 AM   #3
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If versatility is what you are after, then 5.56 is the way to go. I love my .300 blackout a lot! But it has a shorter range. Consider the .300 blk a "cqb only" gun.

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Old 05-15-2014, 01:27 AM   #4
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My advice is that you start with a 5.56. Play around with it. Learn from any mistakes, figure out what you really like...and then maybe set up a spendier 5.56 (or 223 Wylde) that fits you to a tee. And then venture down the 300blk road.

99% of new AR builders will be best served working things out on a 5.56 platform.

But it's good to have both. And eventually, you probably will. The point is- make your mistakes and learn your lessons on the more financially forgiving and versatile platform.

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Old 05-15-2014, 01:36 AM   #5
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5.56 my man the greatest, competition barrel, timney trigger

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Old 05-15-2014, 05:53 AM   #6
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Quote:
Originally Posted by sweeper22 View Post
My advice is that you start with a 5.56. Play around with it. Learn from any mistakes, figure out what you really like...and then maybe set up a spendier 5.56 (or 223 Wylde) that fits you to a tee. And then venture down the 300blk road.



99% of new AR builders will be best served working things out on a 5.56 platform.



But it's good to have both. And eventually, you probably will. The point is- make your mistakes and learn your lessons on the more financially forgiving and versatile platform.


I already have a platform in 5.56 and it's distance capability is on point. I just wasn't sure on the ballistics and dynamics of the 300 Blackout compared to the 5.56. Considering I've never had the opportunity to shoot a 300blk myself.
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Old 05-15-2014, 05:55 AM   #7
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Quote:
Originally Posted by Alpha1Victor View Post
If versatility is what you are after, then 5.56 is the way to go. I love my .300 blackout a lot! But it has a shorter range. Consider the .300 blk a "cqb only" gun.

Thanks for the advice! Since you shoot the 300blk. What are some of the situations you shoot that rifle in?
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Old 05-16-2014, 01:41 AM   #8
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300blk is ultra-versatile, but to (legally) take full advantage of that can be an expensive and arduous process. For my tastes, the ideal 300blk is a 12" SBR with a supressor. After you pour $1-2K into the gun, you've got $1500 worth of suppressor and tax stamp costs, and a 1-year ATF wait.

Ballistically, 300blk compares favorably to a 7.62x39 AK47 with ~125gr supersonic ammo, and it's AR-precise. You can also shoot heavier supersonics such as 147gr, 168gr, 180, etc. The 200-240 bullets are best reserved for a suppressed setup. They're really quiet.

As far as recoil, 300blk really doesn't handle much differently than 5.56. The heavier 30cal bullet can drop off quickly at range, but they're consistent enough to compensate for if you do your homework.

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