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Whats the best 7.62 nato round for an AR-10?
Assuming you just want to buy ammo and not reload, Lake City M118 175 grain HPBT. This may be a bit pricey but you said the best and you also said NATO round rather than some other commercial load. If you are just looking for some decent but cheap shooting rounds, try the German made Dynamit Nobel rounds with the DM 111 encapsulated bullet that Sportsman's Guide is selling. These are 147 grain soft core NATO ball (berdan primed, non corrosive). The bullets are a cupronickel covered mild steel jacketed FMJ, but they will shoot fine and not harm your barrel. And they are dirt cheap.
It should not be a problem out of an American gun. 308 is a higher pressure round, but that is the spec that most US companies build too. For use in a non US gun you should probable contact the manufacturer if you have questions.
Either of the rounds I cited above should be fine in your rifle. The Lake City offering says "20 CTGS 7.62MM Long Range M118" right on the box. Being a military round it is made for 7.62 x 51 rifles but I have shot this also in a .308 varmint rifle. The DM offering says right on the box, "20 Patrone (20 cartriges), 7.62 x 51, DM 111, Weichkern". DM 111 is the bullet previously explained, Weichkern means Soft Core.
Also on the box is a circle with a cross (meaning NATO approved ammo) and a solid black circle (meaning ball ammo). These were manufactured in 94. Still good ammo, I shoot in my M1A.
I saw some of that German ammo on Cheaper than dirts website, even cheaper than on Sportsmans Guide. The barrel on the AR I'm getting is a 7.62, can you shoot safely .308 win out of it?
No. The .308 is a much more powerful round and develops much higher pressures than 7.62 Nato. The rounds fit, but aren't safe.
Some AR-10's are marked .308 on the barrel and also probably in the lower and they are good to go for .308. You can also shoot 7.62 Nato in a .308.
I would never buy an AR-10 which wasn't chambered for .308.
Now, the opposite is true for AR-15. The 5.56 Nato is much more powerful than the .223. You can shoot .223 or 5.56 in a 5.56, but you can't shoot 5.56 in a .223.
Careful.
Funny thing is that I had people tell me the opposite. I even have had a person say that you could shoot booth .308 and 7.62 out of a rifle that has a 7.62 barrel. Anyway I will just buy 7.62. I got a good hookup on some Lake City. Thanks
This thread prompted me to make a call to DPMS. They make their sporting rifles chambered in .308, but they also make the SASS, which I have, chambered on 7.62X51. Interestingly enough when I asked them if I could safety shoot .308 in my rifle chambered for 7.62X51 they said "no problem, but you don't want to shoot 7.62X51 in our rifles chambered for .308".
It's hard to say, but they can speak for their own rifles, assuming you got someone who knows.
Possibilities? The 7.62 has a slightly longer head space than .308 and if they are making their chambers real close tolerance, or are just worried about liability, then they could discourage the 7.62 in their .308. I've never seen a 7.62 that wouldn't easily chamber in a .308 though.
The real issue is that the 7.62 has a max pressure of 50,000 psi, and the .308 runs 62,000. I think much of the worry comes with milsurp guns with loose (normal for milsurp) chambers and the added pressure.
Since the .308 is slightly shorter than the 7.62 but not enough to make much difference, and since DPMS knows how strong their barrels and actions are, they would be the one's to make those claims.
Since the head space on 308 is less than 7.62, the 308 will always fit in the 7.62, the question is that over time, will the 7.62 take the added pressure of the .308? Apparently DPMS says theirs will.
I wouldn't take that as gospel for any other gun though.
Funny thing is that I had people tell me the opposite. I even have had a person say that you could shoot booth .308 and 7.62 out of a rifle that has a 7.62 barrel. Anyway I will just buy 7.62. I got a good hookup on some Lake City. Thanks