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View Full Version : Dumb question, 7.62 x 51 vs. .308


Soldier415
07-20-2008, 8:47 PM
If I order the cheaper surplus 7.62 x 51...can I shoot it through a rifle chambered for .308?

I am drunk and cannot remember, trying to order ammo because the wife wants to shoot the new National Match M1A this weekend.

novanryder
07-20-2008, 8:57 PM
Well guess what? I'm screwed up at the moment, too, and all I can figure out is that 7.62 NATO is referred to .308 and vice versa. I have SEEN more than two people feed both ammos through their .308s (same gun) and no problems... perhaps it's like the .223/5.56 thing? Y'know, pressure or whatever? Either way I don't give a fat ****. I have a load of brand new .308 and a brand new M1A sitting in my lap, too, and it's going to get some use this coming weekend. Where are you at? Let's go shooting. Maybe find some free open public land and have some free fun.

buffybuster
07-20-2008, 9:05 PM
Do a search, I think we just went through this a little while back. All depends on what chamber specs your rifle is.

1911_Mitch
07-20-2008, 9:12 PM
Its a headspace issue. What did the headspace tag say when you got the rifle? 1.631 - 1.633 should be safe to shoot either. Outside of those specs I would have to consult my manual again to be sure.

Pressures are different for the ammo, partly attributed to different testing protocols (military vs commercial).

Genrerally, from what I have seen, most of SAI rifles have appropriate headspace to shoot either .308 or 7.62x51 because they know the rifles are going out to the general public and likely to encounter both types of ammunition.

I have exclusively shot surplus 7.62x51 out of my M14SA, headspace is 1.632

PM sent.

Jicko
07-20-2008, 9:12 PM
Why don't you guys ask this question again when you are sober?

lol...

Anyways... 7.62/.308 JUST like the 5.56/.223 thing, but in reverse...

7.62 in .308 is safe.... .308 in 7.62 is not, theoretically...

Just in reverse of .223 in 5.56 is safe.... 5.56 in "tight" .223 is not....

harlot
07-20-2008, 9:35 PM
Buy the 762, everybody is correct about the differences but Springfield recommends 7.62 for all their M1As. I've found some 308 that doesn't load at all in my M1As, most of it does but I got better accuracy out of M80 and XM80 than almost all the commercial 308 I tried. M118LR on the other hand is the f***ing s***, man I wanna find me some more of that.

Gunsrruss
07-20-2008, 10:53 PM
44gr of 4895 with a 175gr Sierra matchking.:) OAL 2.84

C.G.
07-20-2008, 11:12 PM
44gr of 4895 with a 175gr Sierra matchking.:) OAL 2.84

Not a good suggestion if he is drunk.:D

jandmtv
07-21-2008, 12:26 AM
44gr of 4895 with a 175gr Sierra matchking.:) OAL 2.84

I shoot that same exact load out of my Rem700 5R bolt action and get sub .3MOA groups at 100 yards. My rifle seems to love IMR4895 and Reloder15, and hates Varget.

vf111
07-21-2008, 6:28 AM
http://www.surplusrifle.com/shooting2006/308vs762nato/index.asp

The only .308 I feed my M14 clones are the Federal Gold Medal 168gr loads. Otherwise, it's good quality 7.62x51.

Jicko
07-21-2008, 8:43 AM
I shoot that same exact load out of my Rem700 5R bolt action and get sub .3MOA groups at 100 yards. My rifle seems to love IMR4895 and Reloder15, and hates Varget.

What's your RL15 load?