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View Full Version : .308 & 7.62 x 51 NATO ammo interchangeable?


Steerme
03-22-2012, 2:10 PM
I know that 5.56 NATO rounds are not safe for use in rifles chambered for .223 REM.

Apparently there is a 0.003" variation between .308 Win and 7.62x51 NATO ammo. It might not be ideal but is 7.62x51 NATO (milsurp) ammo safe for use in bolt action (hunting and bench oriented) rifles chambered in .308 Win?

BAGunner
03-22-2012, 2:26 PM
It's safe to fire 7.62x51 NATO in 308Win chamber, as the pressure of 7.62x51 is lower than 308win.

FeuerFrei
03-22-2012, 2:57 PM
I know that 5.56 NATO rounds are not safe for use in rifles chambered for .223 REM.

Apparently there is a 0.003" variation between .308 Win and 7.62x51 NATO ammo. It might not be ideal but is 7.62x51 NATO (milsurp) ammo safe for use in bolt action (hunting and bench oriented) rifles chambered in .308 Win?

Answers (http://www.6mmbr.com/308Win.html)

Divernhunter
03-22-2012, 3:21 PM
Yes shoot away. Just do not hunt game with the FMJ ammo as it is not legal for big game in Ca.

alfred1222
03-22-2012, 3:31 PM
ya go for it, i interchange calibers every once in awhile.

Steerme
03-22-2012, 3:43 PM
Cool. I understood that one can only use non-lead hunting bullets, at least in the condor living regions.

I am thinking about a 308 for hunting and fun shooting. I wanted to make sure that I wouldn't have problems with MilSurp for target practice.

Thanks for the link to the .308 win website. I don't currently reload but buying a 308 may make it a necessity.

robert101
03-22-2012, 4:18 PM
I believe there may be some miss-information on the pressure ratings of 7.62 x 51MM NATO rounds. .....Max pressure for 7.62x51 nato is 50,000 CUP.... CUP, not psi
There is no conversion from CUP to psi.

Recent measurements indicate max pressure to be 61k. So,
308 - Max pressure 62k PSI
7.62 NATO - Max pressure 61k PSI
they are very similar indeed. You will typically find that NATO brass is thicker than commercial 308 brass, therefore, a suggested reduction of 1 to 1.5 grains of powder has been recommended by many. I fire both 7.62 and 308 in my DPMS barrel.

f308gt4
03-22-2012, 4:51 PM
FWIW, my Saiga 308 is stamped 308 Win and 7.62 x 51 on the receiver.

MrPlink
03-22-2012, 4:52 PM
just play it safe and contact the manufacturer, my FN is marked 762nato, but can run 308 all day.

Guapoh
03-22-2012, 7:00 PM
Interesting. My M1A uses both very well. However, when I asked this question to Remington about shooting the milspec 7.62 in my VSF 700 in 308, the said absolutely not and that I risk losing warranty coverage if a failure occurred with the 7.62 in the gun.