Posted: 2/7/2012 7:51:45 AM EDT
| Hello all, long time hunter but new to the black rifle world. I just fnished building my first AR. (Stealth Upper) and im considering purchasing a 7.62 OBR. My question is whether or not I can feed commercial .308 through it? Thanks |
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All day every day and twice on Sunday! NO worries at all with comercial ammo!
Quoted:
Hello all, long time hunter but new to the black rifle world. I just fnished building my first AR. (Stealth Upper) and im considering purchasing a 7.62 OBR. My question is whether or not I can feed commercial .308 through it? Thanks |
| Thanks for the replies, but just to clarify my question for my own piece of mind, I am referring to .308 vs 7.62 ammo. I I understand they are supposed to be dimensionally identical but what about the difference in pressures and case construction between the two? |
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Hope this helps - copied from one of the other forums.
"I found this informative discussion on the .308 Winchester vs. 7.62 X 51 this morning. This information has been provided on these forum pages in bits and pieces, and may well exist in total somewhere, but I thought perhaps it would be worth a revisit for any newbies or those who may be confused by the differences. From the www.6mmbr.com website, select the cartridge comparisons and select the .308 info page, and you'll find a good article on the cartridge, it's potential, bullets & loads. The following is a short excerpt: "Before we go much further, we want to address the oft-posed question “Are the .308 Winchester and 7.62×51 NATO one and the same?” The simple answer is no. 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 7.62×51 max is 50,000 psi. Also, the headspace is slightly different. The .308 Win “Go Gauge” is 1.630″ vs. 1.635″ for the 7.62×51. The .308′s “No-Go” dimension is 1.634″ vs. 1.6405″ for a 7.62×51 “No Go” gauge. That said, it is normally fine to shoot quality 7.62×51 NATO ammo in a gun chambered for the .308 Winchester (though not all NATO ammo is identical). Clint McKee of Fulton Armory notes: “[N]obody makes 7.62mm (NATO) ammo that isn’t to the .308 ‘headspace’ dimension spec. So 7.62mm ammo fits nicely into .308 chambers, as a rule.” You CAN encounter problems going the other way, however. NOTE: A commercial .308 Win round can exceed the max rated pressure for the 7.62×51. So, you should avoid putting full-power .308 Win rounds into military surplus rifles that have been designed for 50,000 psi max. For more information on this interesting topic, read the following articles: Gun Zone’s 30 Caliber FAQ; Cruffler.com Technical Trivia, June 2001; and last, but not least, Steve Redgwell’s .308 vs 7.62×51 Analysis, which really provides a definitive explanation. Reloaders should also note that military ammo often is made with a thicker web. Consequently the case capacity of 7.62×51 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 7.62×51 brass, such as Lake City or IMI." |
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Quoted:
Just shoot the freaking thing and move on! This whole 308 vs 7.62 thing gets old! Just find what shoots best and enjouy the wonderful splendor of the magical OBR!!  Possibly you didnt read the part where I said I am new to these type of rifles. I just finished putting my first 5.56 together last week and Im now considering placing an order for a 7.62 OBR. The Noveske catalog clealy says absolutely NOT in their rifles. The Larue website and catalogs make no mention of it. So.....I pose the question for those that are familiar with the 7.62 OBR and PredatAR. Can and will it safely and reliably feed and shoot .308 cartridges without damage to the gun or tearing the cartridge case apart? I am not going to buy a rifle and experiment with ammo that could possibly destroy the gun or give me trouble. |
| I guess my response was more to the 762 vs 308 ammo differences question that has gone on forever. Its the same issue as the can I shoot 556 in my 223 type of thing. Honestly best bet is to call La Rue and ask them yourself. But if you are asking me for my opioion. I have an OBR and will shoot 308 or 762 depending on what I can get my hands on at the moment and I have never had any issues. But again this is jsut my two cents! |
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Quoted:
Thanks for the replies, but just to clarify my question for my own piece of mind, I am referring to .308 vs 7.62 ammo. I I understand they are supposed to be dimensionally identical but what about the difference in pressures and case construction between the two? The answer to your question will be found on the test target that will come with your rifle. LT uses FGMM 168 gr. .308 for the test shots. .308 is not an issue with this rifle. Mine has never seen a round of 7.62. Like previously mentioned, OAL would possibly be your only concern. |