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  #1  
Old 08-25-2011, 6:40 AM
Papa "J"'s Avatar
Papa "J" Papa "J" is offline
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Default .308 / 7.62x54 (r)?

Just bought my 1st .308 (ar platform). While I await my 10 day jail time, I have been shopping online for ammo.

Can someone explain if there is a big difference in .308 cpmarared to 7.62x54 and can shoot either in my new weapon?

Also I have seen a letter "R" designation on some of the 7.62.54 ammo. Can someone tell me what that stands for.

And if any sees any screaming deal on any of this ammo please let me know.
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Old 08-25-2011, 6:56 AM
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well the case dimensions are totally different between the 308 and the 7.62x54r so it'll be impossible to load 7.62x54r. The bullet diameter is also different too (.308 to .311).

The R is suppose to indicate the case is rimmed.
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Old 08-25-2011, 7:00 AM
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Quote:
Originally Posted by Someguy925 View Post
well the case dimensions are totally different between the 308 and the 7.62x54r so it'll be impossible to load 7.62x54r. The bullet diameter is also different too (.308 to .311).

The R is suppose to indicate the case is rimmed.
So does that mean I should be able to use 7.62x54? Ammo without the "r" designation?
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Old 08-25-2011, 7:11 AM
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No you CANNOT use 7.62x54 ammo in your .308 rifle.

You should however be able to use 7.62x51

Quote:
From another forum...plus this has been discussed here previously IIRC
Enjoy!

OK --- Let's address the oft-posed question "Are the .308 Winchester and 7.62x51 NATO one and the same?"

The simple answer is no. There are differences in chamber specs and maximum pressures.

The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62x51 max is 50,000 psi.

Also, the headspace is slightly different. The .308 Win "Go Gauge" is 1.630" vs. 1.635" for the 7.62x51.

The .308's "No-Go" dimension is 1.634" vs. 1.6405" for a 7.62x51 "No Go" gauge. That said, it is normally fine to shoot quality 7.62x51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical).

Clint McKee of Fulton Armory notes: "[N]obody makes 7.62mm (NATO) ammo that isn't to the .308 'headspace' dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule."

You CAN encounter problems going the other way, however. A commercial .308 Win round can exceed the max rated pressure for the 7.62x51.

So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max.
Reloaders should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62x51 brass is usually less than that of commercial .308 brass.
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Last edited by 97F1504RAD; 08-25-2011 at 7:15 AM..
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Old 08-25-2011, 7:13 AM
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Quote:
Originally Posted by 97F1504RAD View Post
No you CANNOT use 7.62x54 ammo in your .308 rifle.

You should however be able to use 7.62x51
Sorry I meant to type 51 not 54. Only on 2nd cup of coffee.
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