M14 and M1A Talk M14 and M1A rifles - General Posting

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Old 02-07-2009, 18:27   #1
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7.62 vs .308

Assuming I could have my pick between a M1A 7.62 or a M1A .308, which would you choose and why?
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Old 02-08-2009, 06:59   #2
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S, Inc. M1As are all chambered to SAAMI .308 Winchester specifications, the question is moot. Since only S, Inc. manufactures the "M1A," there you go.

7.62-MM (7.62x51 "NATO") and .308 Winchester cartridges have the same physical dimensions. The oft-mentioned pressure difference isn't, as CUP is not piezo PSI; the minor difference that exists is well within the error band for rifles marked either way.

USGI 7.62-MM chambers are "longer" in headspace than .308 Win SAAMI, because M14s and M60s are machine guns whose chambers need the extra space to accomodate fouling & etc. that builds up quite rapidly during full-auto use.

Some foreign arms marked "7.62" are within SAAMI .308 chamber headspace dimenstions, such as my DCRA Enfield. Others have the "long" chamber, such as my Ishapore 2A1. If you have a "long" chamber such as the 2A1 or my M14, use only military ammunition with its tougher, heavier case. However, unless you have a USGI "Navy" 7.62-MM Garand or a USGI M14, you won't be running into the "long" chamber very often. Check headspace.

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Old 02-08-2009, 07:00   #3
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Originally Posted by starman77 View Post
Assuming I could have my pick between a M1A 7.62 or a M1A .308, which would you choose and why?
.308 Win.... You can shoot both .308 and 7.62x51 out of it. (Springfield Armory M1A's are chambered in .308 win). If you look at their websight, it states you can shoot 7.62x51 or .308 Win out of it.

People say if you have a 7.62 chamber, you shouldn't shoot .308 win although there are people out there that say it doesn't matter. (.308 can have higher chamber pressures, but I do not know if what I read is accurate on that.).

A friend of mine has a norinco m14 chambered in 7.62 NATO and has always shot .308 win out of it for the past 15+ years and hasn't had any issues, except for the bolt, which he replaced with a USGI one.
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Old 02-08-2009, 07:08   #4
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Originally Posted by Dacotua View Post

A friend of mine has a norinco m14 chambered in 7.62 NATO and has always shot .308 win out of it for the past 15+ years and hasn't had any issues, except for the bolt, which he replaced with a USGI one.
And he knows that...how? Just because it's marked "7.62-MM" does not mean it has a USGI chamber. IIRC Chinese M14-types have .308 Winchester chambers.

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Old 02-08-2009, 11:07   #5
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All Chinese M14s come with 7.62 NATO chambers and you must
use NATO gauges to correctly check the head space on them.
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Old 02-09-2009, 06:43   #6
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Originally Posted by H2O MAN View Post
All Chinese M14s come with 7.62 NATO chambers and you must
use NATO gauges to correctly check the head space on them.
Assuming one uses the correct gauge for headspace, and headspace is correct, can one shoot .308 out of a Norinco or Polytech M14?
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Old 02-09-2009, 06:57   #7
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Seems like the same argument on the .223 vs 5.56. You can shoot both .223 and 5.56 out of a .223 chambered rifle whereas you should only shoot 5.56 out of a 5.56 chambered rifle.

So, .308 and 7.62 out of a .308 chambered rifle and only 7.62 out of a 7.62?
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Old 02-09-2009, 15:17   #8
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Originally Posted by Mini-14 View Post
Seems like the same argument on the .223 vs 5.56. You can shoot both .223 and 5.56 out of a .223 chambered rifle whereas you should only shoot 5.56 out of a 5.56 chambered rifle.

So, .308 and 7.62 out of a .308 chambered rifle and only 7.62 out of a 7.62?
5.56 is hotter than .223 if I recall correctly. You can shoot 5.56 or 223 in a 5.56 chamber. (Mini-14 and AR-15's generally have 5.56 chambers).

The reverse is supposed to be true on .308 win. .308 has more pressure in the same outter dimension case, so if you have a .308 chamber you can shoot 308 and 7.62x51.

IN MY OPINION, the reason shooting .308 in a 7.62 Nato chamber got a bad reputation is because some people in the past, who reloaded, took the 7.62x51 brass and put powder charges of a .308 win into the cases. (7.62x51) brass is thicker than commercial .308, and the results were super hot shells. A couple of explosive encounters and the great debate started.
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Old 02-09-2009, 15:28   #9
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You are correct, I had it backwards. The 5.56 is hotter than the .223 so, you can shoot the .223 out of the 5.56 chambered rifle but not the other way around.
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