7.62X51 in a .308


Firearm & Gun Forum - FireArmsTalk.com > Long Guns > Auto & Semi-Auto Discussion > AK & SKS Discussion > 7.62X51 in a .308

Reply
 
LinkBack Thread Tools Display Modes
Old 10-14-2009, 01:55 PM   #1
Feedback Score: 0 reviews
 
Yunus's Avatar
 
Join Date: Jan 2009
Location: |,Maryland
Posts: 4,935
Liked 1217 Times on 723 Posts
Likes Given: 386

Default 7.62X51 in a .308

Can a rifle chambered for .308 (specifically Saiga 308) fire both .308 and 7.62X51 rounds safely?

I searched a bunch online and found conflicting information although SAAMI | Unsafe Arms and Ammunition Combinations does not list 7.62X51 as unsafe for a 308.

Any first hand experience with actually doing this?



__________________

"Good people drink good beer."
Hunter S. Thompson

Yunus is offline  
 
Reply With Quote

Join FirearmsTalk.com Today - It's Free!

Are you a firearms enthusiast? Then we hope you will join the community. You will gain access to post, create threads, private message, upload images, join groups and more.

Firearms Talk is owned and operated by fellow firearms enthusiasts. We strive to offer a non-commercial community to learn and share information.

Join FirearmsTalk.com Today! - Click Here


Old 10-14-2009, 02:42 PM   #2
Feedback Score: 0 reviews
 
IGETEVEN's Avatar
 
Join Date: Jun 2009
Location: Tornado \"Just Blow Me\" Alley,Oklahoma U.S.A.
Posts: 8,424
Liked 27 Times on 21 Posts

Default

The simple answer is no.....but yes you can.

Explanation:

There are differences in chamber specs and maximum pressures. The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62x51 max is 50,000 psi. Also, the head space is slightly different. The .308 Win "Go Gauge" is 1.630" vs. 1.635" for the 7.62x51. The .308's "No-Go" dimension is 1.634" vs. 1.6405" for a 7.62x51 "No Go" gauge.

That said, it is normally fine to shoot quality 7.62x51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical).


Nobody makes 7.62mm (NATO) ammo that isn't to the .308 "head space" dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule.

You CAN encounter problems going the other way, however. A commercial .308 Win round can exceed the max rated pressure for the 7.62x51. So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max.

Should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62x51 brass is usually less than that of commercial .308 brass. You may need to reduce recommended .308 Winchester loads by as much as 2 full grains, if you reload with military 7.62x51 brass, such as Lake City or IMI.

The Saiga 308 rifles are chambered for the following calibers: 308Win (7.62x51). The Saiga 308 has THREE locking lugs (all other 308 AKs only have 2) and was made to shoot high pressure hunting ammo from it's inception and incidentally seem to perform more reliably and group better with hot commercial ammo.

Jack

__________________
Jack

ΜΟΛΩΝ ΛΑΒΕ!

"There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter." - Hemingway

“The greatest ignorance is to reject something you know nothing about.”
IGETEVEN is offline  
 
Reply With Quote
Old 10-14-2009, 02:51 PM   #3
Feedback Score: 0 reviews
 
FCross7's Avatar
 
Join Date: Oct 2008
Location: Central Florida
Posts: 1,017
Default

Good post IGETEVEN. When I bought my AR-10, the guy at the gun store gave me about 100 rounds of some old surplus 7.62x51, and I shot it all without any problems. It wasn't nearly as accurate as any of the commercial .308 ammo I've shot, and I had a couple FTE's with it, but other than that there were no problems with it.

-Fred

__________________

"Breathe when you can, shoot when you should."
-Rob Leatham

ΜΟΛΩΝ ΛΑΒΕ!

"Qui desiderat pacem, bellum praeparat; nemo provocare ne offendere audet quem intelliget superiorem esse pugnaturem"

FCross7 is offline  
 
Reply With Quote
Reply

Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Firearms Forum Replies Last Post
.308 or 7.62x51 FCross7 Ammunition & Reloading 2 07-29-2009 12:13 PM
.308 vs. 7.62X51 9RobertJ Ammunition & Reloading 12 03-27-2009 12:01 AM
WTS:7.62x51/308 Training Ammunition 500rnd.Case $105.00,7.62x51/308 DAG Blanks $55.00 Cope's Distributing Sponsor Display 1 03-24-2009 04:46 PM