7.62 NATO vs. 308

[UrbanWolf]

OK, I've been getting all kind of answers for this, hopefully someone with knowledge can answer this. Do 7.62 NATO and 308 have the same spec bullet(diameter and such)? And which one has more pressure? Can I shoot 7.62 NATO in 308 chamber?

[sportbikeco]

Yes.

.308

Yes.

[nathan0259]

Above post nailed it.

[SideShow Bob]

Read this:

http://www.google.com/url?sa=t&rct=j&q=7.62%20nato%20vs%20.308%20win&source=web&cd=2&ved=0CC4QFjAB&url=http%3A%2F%2Fwww.fulton-armory.com%2F%255Cfaqs%255CM14-FAQs%255C308.htm&ei=4vz6Uof8BeOc2AW95oH4BQ&usg=AFQjCNEHH5gjvdNcL_3UmIXj4xydS8HLOA&bvm=bv.61190604,d.b2I

[spleify]

Yep, same

[spqrzilla]

While SAAMI specs appear to spec out a higher pressure limit for commercial .308 Win than military specs for 7.62x51NATO, the reality is that the bulk of the difference is confusion between old CUP and PSI together with the fact that the military specifications for testing pressure and for deciding a lot was out of spec are not comparable to SAAMI.

For reliable sources of ammo, they are effectively interchangeable.

[<MADDOG>]

http://www.fulton-armory.com/%5Cfaqs%5CM14-FAQs%5C308.htm

[spqrzilla]

Same as link above in #4

[brutal]

While SAAMI specs appear to spec out a higher pressure limit for commercial .308 Win than military specs for 7.62x51NATO, the reality is that the bulk of the difference is confusion between old CUP and PSI together with the fact that the military specifications for testing pressure and for deciding a lot was out of spec are not comparable to SAAMI.

For reliable sources of ammo, they are effectively interchangeable.

Good read here: https://www.ar15.com/archive/topic.html?b=6&f=6&t=268417

[jerrymrc]

Always shot for 1.631-2 in the fal's and never had an issue. I also have one that shoots well that is on the loose side. Add for this, take away for setback, blah, blah........ If it closes on a go and does not close on a no-go that is fine. I load on .308 dies because I have never seen 7.62X51 dies and it always goes bang.[blah-blah][LOL][Sarcasm2]

[spqrzilla]

Good read here: https://www.ar15.com/archive/topic.html?b=6&f=6&t=268417

The op rod issue in Garands and M1A/M14 design rifles is sort of a separate issue from what we were discussing. Its a design specific issue. Rounds with slow powders put a strain on the op rod due to high port pressures. Related but separate from exceeding peak pressure specs.