7.62x51 vs. 308
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Old 01-21-2012, 04:35 PM   #1
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Default 7.62x51 vs. 308

I am looking at buying a new AR and was just wondering if there is a difference between the two rounds like there is between the 5.56 and 223 round. Do you buy one marked with the NATO round to shoot both 7.62 and 308 or does it matter.

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Old 01-21-2012, 04:46 PM   #2
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Quote:
Originally Posted by Dkerr
I am looking at buying a new AR and was just wondering if there is a difference between the two rounds like there is between the 5.56 and 223 round. Do you buy one marked with the NATO round to shoot both 7.62 and 308 or does it matter.
They are not the same. My ArmaLite's manual states it is "dual chambered" and is therefore safe to fire either.

Get with the manufacturer before you buy, just to be sure.
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Old 01-21-2012, 04:54 PM   #3
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Originally Posted by Dkerr View Post
I am looking at buying a new AR and was just wondering if there is a difference between the two rounds like there is between the 5.56 and 223 round. Do you buy one marked with the NATO round to shoot both 7.62 and 308 or does it matter.
They are not the same and I believe the safe use of the 7.62 and .308 is opposite that of the .223 and 5.56. In other words, you can shoot the 7.62 in a .308 chambered rifle but not a .308 in the NATO 7.62. But please verify that before buying anything...
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Old 01-21-2012, 06:27 PM   #4
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JPyle is correct. The .308 Winchester can safely shoot 7.62 NATO. The reverse is not always true.

Someone will come along in a minute and tell you they have done that, and nothing bad happened.

OK- I ran a red light last month, and nothing bad happened. How long do you think I can keep doing that?

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Old 01-21-2012, 06:35 PM   #5
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The way I understand it is that you can shoot .223 in a 5.56, but you cannot shoot 5.56 in a .223.

You can shoot 7.62 in a .308, but you cannot shoot .308 in a 7.62.

Basically, it is better (simpler) to buy a 5.56 and a .308. That way you don't have to worry about this.

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Old 01-22-2012, 12:22 PM   #6
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The way I understand it is that you can shoot .223 in a 5.56, but you cannot shoot 5.56 in a .223.

You can shoot 7.62 in a .308, but you cannot shoot .308 in a 7.62.

Basically, it is better (simpler) to buy a 5.56 and a .308. That way you don't have to worry about this.
Bingo!


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The primary difference between .223 Remington and 5.56 x 45 mm is that .223 is loaded to lower pressures and velocities compared to 5.56 mm. .223 Remington ammunition can be safely fired in a 5.56 mm chambered gun, but the reverse can be an unsafe combination. The additional pressure created by 5.56 mm ammo will frequently cause over-pressure problems such as difficult extraction, flowing brass, or popped primers, but in extreme cases, could damage or destroy the rifle. Chambers cut to .223 Remington specifications have a shorter leade (throat) area as well as slightly shorter headspace dimensions compared to 5.56 mm "military" chamber specs, which contributes to the pressure issues.
It's my understanding of all that I've read that the .308/7.62 x 51 issue is just the opposite. The "civilian" round is hotter (higher pressure) than the NATO round, so it's not a good idea to fire a .308 round in a weapon designed and chambered for the NATO round.
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Old 01-22-2012, 03:17 PM   #7
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Here we go again!

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Old 01-22-2012, 04:23 PM   #8
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Here we go again!
Yep, seen this discussion before.
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Old 01-23-2012, 03:00 AM   #9
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Thanks everyone I will buy the NATO round. :-)

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