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Old 12-03-2010, 09:08 PM
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Default Any difference between .308 and 7.62x51 at all?



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I know that these rounds are more or less interchangable but I'm curious if there is any reason to stock both types as I own rifles chambered for both.
Old 12-03-2010, 09:53 PM
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It's a lot like the .223/5.56 only in reverse. This time the civilian load is the hotter one. Combined with thinner brass, it's not safe to shoot in the larger, looser, 7.62 chamber. But you can shoot 7.62 in .308 chambered guns, which is why they're almost always .308 chambered. Civilian guns are, anyway.
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Old 12-04-2010, 07:29 PM
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First post wins the internet
Old 12-04-2010, 08:02 PM
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Glad to hear that since it's cheaper to stock up on mil-surp stuff.
Old 12-05-2010, 03:17 PM
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Quote:
Originally Posted by MikeK View Post
It's a lot like the .223/5.56 only in reverse. This time the civilian load is the hotter one. Combined with thinner brass, it's not safe to shoot in the larger, looser, 7.62 chamber. But you can shoot 7.62 in .308 chambered guns, which is why they're almost always .308 chambered. Civilian guns are, anyway.
This.

The civilian .223 was orignally loaded as varmit cartridge. The military took it up and realize they could increase it's effectiveness on 2 legged animals by loading it up a little. So the 5.56 is usually "spicy" compared to the civilian .223

The reverse is true with .308 because the civilian .308 is often hot loaded for game hunting. Larger bullets, different powders, ect. So a thicker case meant for more spicy loads. The military 7.62 didn't need to be loaded with 180gr soft points :P So it was more effective to just keep the military 7.62 a little tame so it wouldn't shake apart military weapons.
Old 12-06-2010, 05:55 PM
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Here is the simple answer.

The Gun Zone 7.62 vs .308
Old 08-22-2012, 03:33 PM
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Funny - a lot of people who think they're knowledgeable about rifle cartridges swear up and down that .308 and 7.62x51 are the same. They're not!
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Old 08-22-2012, 04:18 PM
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Quote:
Originally Posted by GunBugBit View Post
Funny - a lot of people who think they're knowledgeable about rifle cartridges swear up and down that .308 and 7.62x51 are the same. They're not!
Except that they pretty much are.
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Old 08-22-2012, 08:47 PM
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I have a recent .308 bolt action that doesn't like 7.62x51. One time it even pulled bottom of german surplus.
Old 08-22-2012, 08:56 PM
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To add I stopped buying mil surplus. There isnt more off the grman surplus rounds. Plain jane Remingtton core lokt shoot the best for me at range and its the cheapest at .75 cents a round. When I get more time I'll pump out reloads for what I want.
Old 08-22-2012, 09:40 PM
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Basically.. The only people who would ever realize are handloaders and those with micromiters and too much time on their hands.
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Old 08-23-2012, 12:24 AM
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they are different and when it comes to surplus arms be carefull shooting .308 win factory ammo. i know M14's will not take anything over 165 grains without doing damage to the gas system and the op rod eventually. never have had an issue shooting surplus 7.62 through a .308 chamber and its a cheap way to practice field posistions.
Old 08-23-2012, 03:06 AM
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Quote:
Originally Posted by arnoldrew View Post
Except that they pretty much are.
Are they the same? Yes or no? It's not a difficult question.
Old 08-23-2012, 06:48 AM
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Quote:
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Are they the same? Yes or no? It's not a difficult question.
If you are looking for a distinct yes or no, then the answer is No. This subject has already been beat to death across the internet.

And I will leave this alone with just one of several reasons and that is primer hardness. Not going to get into the other stuff, the info is out there and I won't be debating it on this board.
Old 08-23-2012, 06:54 AM
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Quote:
Originally Posted by WhyNot View Post
If you are looking for a distinct yes or no, then the answer is No. This subject has already been beat to death across the internet.

And I will leave this alone with just one of several reasons and that is primer hardness. Not going to get into the other stuff, the info is out there and I won't be debating it on this board.
So no differences at all? Is that correct?
Old 08-23-2012, 12:44 PM
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http://www.fulton-armory.com/%5Cfaqs...FAQs%5C308.htm

You know, anyone could have looked this up for themselves. The info is all over the net in a number of places.
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Old 08-23-2012, 02:30 PM
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external case dimensions are the same... chamberings, brass specifications, and loads might vary a little between the two
Old 09-07-2016, 11:23 AM
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Quote:
Originally Posted by mefunkymxw View Post
external case dimensions are the same... chamberings, brass specifications, and loads might vary a little between the two
Actually brass specifications and loads will vary as much or more among individual loads in either nominal caliber than between ".308Winchester" and "7.62x51mm"

Every different load from every different company varies slightly -- and that is true of every caliber.

The most common US military load for "7.62mm NATO" was the M80 Ball which uses a 147gr FMJ projectile, but the M80A1 used a 114.5gr FMJ projectile, and the US military has adopted and used "7.62mm NATO" ammunition with projectile weights as heavy as 175gr. Each of those rounds is "different" in that it will have a different chamber pressure and a different impulse when fired.

Likewise other NATO and SEATO countries have adopted various "7.62mm" rounds that are each slightly different from each other. There is even a German, DM18A1B1 with a 10gr plastic bullet! But they are all "7.62x51mm" also known as "7.62mm NATO"

Meanwhile in ".308 Winchester" - various commercial loads vary widely. Winchester themselves makes the .308 in loads from 120 to 168gr including several different 150gr loads. A quick glance at just one ammo supplier online lists 12 distinctly different bullet weights ranging from 125gr to a whopping 180gr load in .308 Winchester -- with the 180gr loading available from 6 different manufacturers -- each of which is slightly different from the other load in the same caliber and weight.

Every individual firearm is also slightly different - not just from one model or company to another but each individual gun. Remember that specifications are always "plus-or-minus" - the differences may be small, but they are still differences.

Most guns will be more accurate with some rounds than others - we usually think of this in terms of bullet weight and velocity, but yes, some guns will actually shoot better with one specific load rather than the "same" load from another company.

Any mechanically sound firearm chambered in either ".308 Winchester" or "7.62mm NATO" or "7.62x51mm" should be safe to fire with any SAAMI or MilSpec compliant load marked as any of those calibers.

There may be room to question the long-term effects of particularly heavy civilian loads in some military designed rifles. People frequently claim that the M14 (and the mechanically similar M1A) risk damage to the operating rod from heavy civilian loadings due to the higher impulse. I have not seen any reliable source to support this contention -- it appears to be based entirely on the idea that the M14 (and the M1A) are mechanically similar to the M1 Garrand which did occasionally suffer oprod damage from heavy civilian .30-06 loads. The M14 is NOT really just an M1 with a detachable box magazine. Military manuals for the M14 have exactly the same ammunition warnings as military manuals for every military firearm - the manuals say to use only authorized military ammo, but that is standard text in every military weapon manual from pistols and rifles up through tanks and heavy artillery. The User Manual published by Springfield Armory for their M1A rifles has several pages about what kind of ammo you should or should not use in the M1A rifles, but nothing at all against using any heavy bullet weights. What Springfield says is "The M1A is designed and built to specifications to shoot standard factory .308 made to SAAMI specifications or 7.62x51 NATO ammunition." All the major commercial .308 loads, including the 180gr loads from Winchester and other manufacturers, are made to SAAMI specs and do not void the warranty on an M1A. Personally I might hesitate to use the heaviest .308 loads in a Chinese Norinco M14 but I wouldn't worry about any new commercial or recent military ammo in any quality firearm labeled as either .308 or 7.62mm
Old 09-07-2016, 12:03 PM
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