.308 vs. 7.62X51
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Old 03-25-2009, 09:06 PM   #1
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Default .308 vs. 7.62X51

Whats the difference between the 7.62 Nato and the .308 cases? I wanted to know because I been sizing the 7.62 with my new Hornady .308 dies and didn't want to break them or load them as a 308 if they aren't. Any help would be good, Thanks

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Old 03-25-2009, 10:16 PM   #2
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Google lists about a zillion links on this one. 451,000 actually. Google: "308 Win 7.62 NATO"

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Old 03-25-2009, 11:16 PM   #3
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Are they not the same?

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Old 03-26-2009, 01:13 AM   #4
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Here click on this.

The 308 win runs at a slightly higher pressure than the 7.62 NATO round. The mil spec brass is thicker and you should reduce any load by 5%to 10%. You can and will get 762 brass that was fired in a MG if that happen you are SOL as this brass can't be fired in a regular bolt action gun. You can shoot 762 in a factory 308 chamber but if you have a rifle that is chambered for a 7.62NATO you can't fire 308 win in it. If you do you take a chance of hurting the rifle.

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Old 03-26-2009, 01:50 AM   #5
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Here click on this.

The 308 win runs at a slightly higher pressure than the 7.62 NATO round. The mil spec brass is thicker and you should reduce any load by 5%to 10%. You can and will get 762 brass that was fired in a MG if that happen you are SOL as this brass can't be fired in a regular bolt action gun. You can shoot 762 in a factory 308 chamber but if you have a rifle that is chambered for a 7.62NATO you can't fire 308 win in it. If you do you take a chance of hurting the rifle.
I agree with most of this info. Definately reduce the loads for the NATO brass. You MAY have issues with MG fired brass in a bolt gun, depending on the chamber dimensions of the MG, your sizer die and your chamber. A match tight chambered .308 like a Remmy PSS will not likely take ANY reload.
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Old 03-26-2009, 02:05 AM   #6
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I shoot .308 Win in my M1A all the time. I've been doing so for 20 + years and it still holds less than 1" groups @ 100 yards. In semi-auto mode I limit my grain bullets to 175 grain. However, I turn the gas off, cycle the action manually and shoot 180 to 200 grain bullets all the time as well. I've seen no damage or excessive wear on this rifle by using .308 win. and the heavier weight grain bullets. Is this model rifle an exception to the 7.62X51 vs. .308 Win. rule?

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Old 03-26-2009, 03:38 AM   #7
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I shoot .308 Win in my M1A all the time. I've been doing so for 20 + years and it still holds less than 1" groups @ 100 yards. In semi-auto mode I limit my grain bullets to 175 grain. However, I turn the gas off, cycle the action manually and shoot 180 to 200 grain bullets all the time as well. I've seen no damage or excessive wear on this rifle by using .308 win. and the heavier weight grain bullets. Is this model rifle an exception to the 7.62X51 vs. .308 Win. rule?
No one said if you do this it is going to blow up in your face on the 300th round.

I said IT COULD damage the rifle. The M1a is a very strong action and is built like the hulk.
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Old 03-26-2009, 05:20 AM   #8
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A match tight chambered .308 like a Remmy PSS will not likely take ANY reload.
Rem. 700P . . . used to be PSS, is a standard chamber. The whole reason people buy them is for match loading ammo -- "reloads."

The military M-40 is a Rem. 700 PSS -- Military armorers load ammo for these guns. I'm going to question that they're shooting NATO brass, but rather probably match brass. I just bought a load of FC headstamp (Federal) 308 Win. once-fired from Washugal Co. Sheriff. Pretty sure their guns are Rem. 700 P.

"Match chamber" pertains to the neck/throat/leade . . .

Here's a link:

Varmint Al's Handloading/Reloading Page

Look at "Factory Chambers" and "Custom Chambers."
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Old 03-26-2009, 06:26 AM   #9
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I guess it depends on the rifle. I had a PSS that would not chamber anything reloaded. I tweaked and tinkered but that thing was tight.

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Old 03-26-2009, 10:24 AM   #10
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Hey thanks for the help, the ammo I am using is that cheap OFV M80 stuff, its brand new, havent had any problems shooting it out of my Rem 700. They are packed in 10 round packs, I resized them with my 308 die and was just wondering, but I'll reduce the powder by 5 percent. Thanks

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