PDA

View Full Version : 308 DPMS BARREL


emy
09-28-2011, 8:14 PM
Is it OK to shoot 7.62x51 mil. surplus on DPMS barrel stamped 308 win.?

UBFRAGD
09-28-2011, 8:22 PM
I don't know, but this never gets old!!

http://www.calguns.net/calgunforum/showthread.php?t=463687

Josh3239
09-28-2011, 8:25 PM
Yes of course you can. A quick google search could have answered the question.

fmunk
09-28-2011, 8:32 PM
Yes of course you can. A quick google search could have answered the question.

Google is just too hard for some people it seems.

Josh3239
09-28-2011, 8:37 PM
Google is just too hard for some people it seems.

Sometimes I do this (http://lmgtfy.com/?q=.308+vs+7.62+nato) :D

fmunk
09-28-2011, 8:39 PM
Sometimes I do this (http://lmgtfy.com/?q=.308+vs+7.62+nato) :D

I used to too, but that apparently is too difficult for some still.

emy
09-28-2011, 8:50 PM
why do they make 308 barrel stamped 308win. and 7.62x51 , is it like chevy and GM ? Also i've seen some article that it's not safe because the higher pressure of the other. thanks guys.

fmunk
09-28-2011, 10:36 PM
See? Google is too hard.

slick_711
09-28-2011, 11:22 PM
why do they make 308 barrel stamped 308win. and 7.62x51 , is it like chevy and GM ? Also i've seen some article that it's not safe because the higher pressure of the other. thanks guys.

Huh? http://www.calguns.net/calgunforum/images/smilies/confused.gif

Because .308 Winchester is the cartridge's full nomenclature. That is the correct marking, I feel that your question is vague and nonsensical.

There are differences between .308WIN and 7.62x51 NATO. However, they are minor differences, and of the two cartridges the .308WIN is the higher pressure. If the barrel is stamped .308WIN you may safely shoot either cartridge. In guns chambered for 7.62x51 the safe consensus is not to shoot .308WIN ammo (though personally I'd consult a gunsmith and take it on a case by case basis for different types of rifles).

The difference between .308WIN and 7.62x51 is the opposite of the .223REM vs. 5.56x45mm with regards to whether the military or civilian cartridge is higher pressure than it's counterpart.

Of course, this information was provided to you in a link in the very first response to your thread. It was also readily available in over a dozen earlier Calguns threads and at hundreds of websites.

captbilly
09-29-2011, 12:57 AM
There is a lot of misinformation on the differences between 5.56 vs. .223 and 7.62 vs. .308. Though the specs would seem to indicate that the chamber pressures are significantly different between the two, in fact the main main reason for the seemingly different pressures is the method of measuring the pressure. There are also some very slight differences in the case dimensions between each pair. In virtually any modern rifle there is no safety issue with using either cartridge. But, there are issues with using one chamber with the other cartridge when absolute accuracy is the goal.

goodlookin1
09-29-2011, 6:41 AM
There is a lot of misinformation on the differences between 5.56 vs. .223 and 7.62 vs. .308. Though the specs would seem to indicate that the chamber pressures are significantly different between the two, in fact the main main reason for the seemingly different pressures is the method of measuring the pressure. There are also some very slight differences in the case dimensions between each pair. In virtually any modern rifle there is no safety issue with using either cartridge. But, there are issues with using one chamber with the other cartridge when absolute accuracy is the goal.

As I understand it, the OUTSIDE dimensions of the cartridge are the same. However, 7.62 brass is a little thicker, which makes less room for powder and adds to a slight pressure build up given the same amount of powder used as in a .308 case. However, the CHAMBERS are slightly different, making the .308 a bit tighter in tolerances for bolt/semi shooting. The 7.62 chamber is spec'ed with fully automatic fire in mind: Having looser tolerances decreases accuracy a little but increases the reliability in feeding.

I have been told that there is no danger in shooting either in either chamber and I have used both loads in my .308 AR'd 7.62x51 chamber, but understand this: Shooting .308 in a 7.62 chamber will work/stretch the brass a little more than a .308 chamber. Not sure if this matters to you as you didnt mention if you will be reloading or not, but it will tend to shorten the life of your brass moreso than a .308 chamber.

In any case, the .308/7.62 issue is nothing like the .223/5.56 issue. 5.56 runs on much higher pressures, which a .223 chamber was not designed to withstand.

rt7
09-29-2011, 11:29 AM
http://i823.photobucket.com/albums/zz153/rt7pic/DPMS_Final_Word_762vs308-2.jpg
THE END.