.308 or NATO 7.62


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Old 12-10-2013, 03:47 PM   #1
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Default .308 or NATO 7.62

Someone at my gun club gave me a lot of mixed ammo; .308 and .7.62 NATO thinking that I could fire it all my rifles. My DPMS LR-308 and Browning Lever rifle will only shoot .308 and that's per info I got directly from those two manufacturers. Both advised not to use the 7.62 NATO. Is there a way that I can sort the .308 and the 7.62 NATO ammo so that I can keep just the .308 ammo that I can use? Thanks in advance. Regards. Jerry



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Old 12-10-2013, 04:05 PM   #2
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Jerry- first, welcome to the forum- when you get a moment, stop by the intro thread and say hello.

In general- A rifle chambered for .308 Winchester can ALSO safely shoot 7.62 NATO. However, a rifle chambered for 7.62 NATO will not always be safe to shoot .308 Winchester. It is the opposite of the 5.56 and .223 situation.

This is a 7.62 NATO round. Note the circle with the cross? Symbol that indicates a STANAG (Standard NATO Agreement) cartridge.

f_308.jpg



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Old 12-10-2013, 04:49 PM   #3
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Agreeing with c3.

7.62nato will shoot with no problems out of any 308. May not get great accuracy out of a 308 since most NATO is 147grain which performs bleh out of. Typical 1-10 twist 308win barrel. 7.62nato is 1-12 twist and works well with anything up to 168grn.

The real diff tween the two other than rifling twist rate is the 7.62nato has a shorter lead on the throat.

The exception to this rule is the fn scar17 which has a 1-12 twist and a 308win throat and marked 7.62nato

If yours is marked 308 win you can shoot both you just won't get good results with the NATO which is why dpms says don't use it. They don't want people calling tech support btching about poor accuracy

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Old 12-10-2013, 06:42 PM   #4
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I can think of no reason why any gun manufacturer would tell you cannot shoot 7.62 ammo out of a 308 rifle. After all they are identical. Unless they are concerned about the bullet itself as if it is some king of tracer or steel jacket.

Take a look at this Federal ammo. One is a 308 Winchester and the other is 7.62 NATO. Note, the same weight bullet generates identical velocities for both. The only way that can happen is if they are operation at the same pressures.

http://www.midwayusa.com/product/953358610/federal-premium-gold-medal-ammunition-308-winchester-168-grain-sierra-matchking-hollow-point-boat-tail

Technical Information
Caliber: 308 Winchester
Bullet Weight: 168 Grains
Bullet Style: Sierra MatchKing Hollow Point Boat Tail
Case Type: Brass


Muzzle Velocity: 2650 fps
Muzzle Energy: 2619 ft. lbs.


http://www.midwayusa.com/product/953713383/federal-american-eagle-ammunition-762x51mm-nato-168-grain-open-tip-match

Technical Information
Caliber: 7.62x51mm NATO
Bullet Weight: 168 Grains
Bullet Style: Open Tip Match
Case Type: Brass

Ballistics Information:
Muzzle Velocity: 2650 fps
Muzzle Energy: 2619 ft. lbs.


I can't imagine why DPMS or Browning would object to either one of these in their rifles.

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Old 12-10-2013, 08:16 PM   #5
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The issue is not necessarily peak pressure, but pressure curve. The two listed cartridges are not necessarily "identical". Velocities can be reached differently. Some guns (like the M1-A) are not suitable for the slower powders used in many commercial .308 rounds. Pressures peaking at a different point can wreak havoc on the operating rod.

Just because a domestic manufacturer labels something as "7.62 NATO" does not mean it is actually made to NATO specs. There is the disctinct possibility something may be mislabeled.

I do not believe there is a NATO standard for 7.62 X 51 168 gr OTM ammo.

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Old 12-10-2013, 08:21 PM   #6
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Have you wondered why Federal offers a .308 Win and a 7.62X51?

If they were the same why waste money to have two different labels for the same round?

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Old 12-10-2013, 10:03 PM   #7
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Quote:
Originally Posted by robocop10mm View Post
The issue is not necessarily peak pressure, but pressure curve. The two listed cartridges are not necessarily "identical". Velocities can be reached differently. Some guns (like the M1-A) are not suitable for the slower powders used in many commercial .308 rounds. Pressures peaking at a different point can wreak havoc on the operating rod.
This is a good point, cept it's backaswards as to the OPs situation. He was told not to shoot 7.62 ammo in his 308, not the other way around.

IMR-4895/WC-846 was one of the powders specked out in 7.62 Ball M118 ammo. Noting about this powder and it's pressure curve is going to cause issues with the OP's Browning lever gun or his 308 DPMS or even the M1-A.

If Browning and DPMS told him to not use Winchester Supreme ammo or other high performance ammo, maybe, but not mil-spec 7.62 ammo. No way any of that is going to bend an op rod. Besides, neither of his rifles have Op rods.
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Old 12-12-2013, 02:09 PM   #8
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I went to the Browning web site and reviewed the owners manuals for both the pre-93 BAR and the BAR Mk II. I saw NO reference to the caliber conflict.

If this was actually a part of the OP's manual I would like to see the scanned pages. Otherwise we are about to be done here.

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Old 12-12-2013, 02:31 PM   #9
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I got hold of some South African 7.62x51 that was definitely on the hot side. I noticed the difference in recoil over the 308 rounds in a Savage 10. Some of this so called surplus may be out of spec rejects.

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Old 12-12-2013, 03:34 PM   #10
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Quote:
Originally Posted by danf_fl View Post
Have you wondered why Federal offers a .308 Win and a 7.62X51?

If they were the same why waste money to have two different labels for the same round?
Because you people won`t shoot .308 in your 7.62x51 rifles & you think they are going to miss out on that money. I have a friend who works at Lake City & says that most of the time when they switch from .223 to 5.56 the only thing they change is the bullet & head stamp !............


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