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kemassey
February 1, 2010, 06:47 PM
I found some Federal ammo at a gun show yesterday. I hope I got a good price and didn't end up with reloaded ammo. I'm new enough in the firearm field to not know exactly what I'm looking at. The ammo box is marked XM762D 7.62X51 149 GR. FMJ. The stamp on the shell is FC 05. I've seen other brass that is shinier than this brass. The casing at the top almost looks like it has been warm and cause it is a darker color. What should I look for to see if this is reloads? I paid 15 for a box of 20. Don't know if I overpaid. I can post pics if need be. Thanks. I was also told this was nato spec ammo with a sealed primer.

Jimro
February 1, 2010, 07:21 PM
The color on the neck is left over from the annealing.

Look for a circle with a cross in it on the headstamp. That means "NATO Spec"

Sounds like good ammo to me.

Jimro

kemassey
February 1, 2010, 07:29 PM
I did find a circle with a cross inside. I'm happy I got some decent ammo. You are taking chances buying certain stuff at gun shows.

Grandpatime
February 1, 2010, 07:33 PM
my walmart got feds 308 win for 13$ a box like 7 box's

mrawesome22
February 1, 2010, 10:58 PM
It's not .308Win ammo. It's 7.62X51NATO ammo. There is a difference.

Grandpatime
February 1, 2010, 11:53 PM
clearly says 308 win on the box

jkohler
February 2, 2010, 12:05 AM
you can fire .308 out of a rifle chambered in 7.62x51 but you cannot fire 7.62x51 out of a rifle chambered in .308

Grandpatime
February 2, 2010, 12:21 AM
why not?, and dont say pressure difference because thats irrelevant in a bolt action

jkohler
February 2, 2010, 12:37 AM
the 7.62x51 case is a little larger than the .308 check specs online you will see

Grandpatime
February 2, 2010, 12:40 AM
oh:o

jkohler
February 2, 2010, 12:44 AM
7.62x51 is a nato round and .308 commercial round :)

mrawesome22
February 2, 2010, 10:29 AM
The ammo box is marked XM762D 7.62X51 149 GR. FMJ.;)

jkohler
February 2, 2010, 10:49 AM
get .308 specs online and a micrometer and mic it to specs only way to be sure and if not sure dont shoot them better to spend a few more bucks on the right shells and not damage your firearm or your self have fun and besafe:D

uncyboo
February 2, 2010, 11:14 AM
Oh no not again.............

GeauxTide
February 2, 2010, 12:57 PM
Yep, another crapola argument about nothing. 308 is the 7.62x51. The only difference is the INTERNAL capacity, crimped necks, and primer pockets.

uncyboo
February 2, 2010, 01:10 PM
Yep, another crapola argument about nothing. 308 is the 7.62x51. The only difference is the INTERNAL capacity, crimped necks, and primer pockets.

I've asked several times for anyone who likes to debate the .308 vs. 7.62 x 51 argument to please show some viable documentation that fireing one vs. the other has damaged a firearm. I never get a reply.

The only halfway believable point I've heard was on a CETME forum, and as those rifles are really agressive in cycling, the commercial brass, being not quite as hard as mil-spec, would occasionally have a rim ripped off.

The rest of this argument is just silly to me. Tens of thousands of shooters have interchanged these loads for years, and I has of yet heard anything about "my rifle went kaboom because I shot .308 instead of 7.62 x 51", or vice versa.

jkohler
February 2, 2010, 02:33 PM
308 Winchester (SAAMI) Gauges

GO - 1.6300"
NOGO - 1.6340"
FIELD - 1.6380"

Shop (Military) Gauges

GO - 1.6350"
NOGO - 1.6405"
FIELD - 1.6455"
here is the difference have a good day

kemassey
February 2, 2010, 05:05 PM
My DPMS LR308AP4 is marked 7.62X51 on barrel. I know that I can use .308 or 7.62X51. I didn't post this to start an argument just to get some info on ammo. I also have heard that shooting nato ammo in a gun that isn't designed for it is bad. Has to do with higher pressure. I still wouldn't take any chances on doing it because I could.

tINY
February 2, 2010, 05:54 PM
Yeah, don't fire that stuff in your 308... send it to me to feed my M1A.

:D



-tINY

jkohler
February 2, 2010, 06:29 PM
if your fire arm is chambered in 7.62x51 you can fire .30 but not the other way around

Toxdoc
February 2, 2010, 06:49 PM
if your fire arm is chambered in 7.62x51 you can fire .30 but not the other way around


http://www.fulton-armory.com/308.htm

The other way around is probably closer. As long as your rifle headspaces appropriately, both can be fired from the same gun. There may be some issues with top pressure .308 loads in a 7.62x51 chamber.

Reloaded brass is another story. Due to differences in the brass, shooting reloaded 7.62x51 in a .308 chamber can be challenging.

uncyboo
February 2, 2010, 07:17 PM
here is the difference have a good day

I didn't ask for the differences. I asked for specific incidences where a firearm was damaged by firing the ammo you claim will do so.

This debate is older than Al Gore's internet. It always seems to be split about 50/50. If it was so unsafe you'd see pics all over the gun forums of a kaboomed rifle with the nay-sayers all gloating over "I told you so".

brmfan
February 2, 2010, 07:22 PM
Uncyboo: +1

MTT TL
February 2, 2010, 07:55 PM
you can fire .308 out of a rifle chambered in 7.62x51 but you cannot fire 7.62x51 out of a rifle chambered in .308

Um, no. And please stop saying that.

The 7.62x51mm NATO (official NATO nomenclature 7.62 NATO) is a rifle cartridge developed in the 1950s as a standard for small arms among NATO countries. Specifications for the 7.62x51mm NATO cartridge are not identical to the commercial .308 Winchester though they are safely interchangeable.[3] When loaded with a bullet design that expands, tumbles, or fragments in tissue, this cartridge is capable of delivering devastating terminal performance, including remote wounding effects known as hydrostatic shock.[4][5][6]

Parent case .300 Savage
Case type Rimless, Bottleneck
Bullet diameter 0.309 in (7.8 mm)
Neck diameter 0.343 in (8.7 mm)
Shoulder diameter 0.454 in (11.5 mm)
Base diameter 0.470 in (11.9 mm)
Rim diameter 0.473 in (12.0 mm)
Rim thickness 0.050 in (1.3 mm)
Case length 2.015 in (51.2 mm)
Overall length 2.800 in (71.1 mm)
Rifling twist 1 in 12 in (305 mm)
Primer type Large Rifle
Maximum pressure 62,000 psi (430 MPa)

Parent case .300 Savage
Case type Rimless, Bottleneck
Bullet diameter 7.80 mm (0.307 in)
Neck diameter 8.77 mm (0.345 in)
Shoulder diameter 11.53 mm (0.454 in)
Base diameter 11.94 mm (0.470 in)
Rim diameter 12.01 mm (0.473 in)
Rim thickness 1.27 mm (0.050 in)
Case length 51.18 mm (2.015 in)
Overall length 69.85 mm (2.750 in)
Rifling twist 1:12"
Primer type Large Rifle
Maximum pressure 345 MPa (50,000 psi)

jkohler
February 2, 2010, 10:34 PM
Well I guess his opinion must be the right one for him, at least I may not be right but I have that right you know I could fire a 44mag out of a 410 but that does not mean that its right I know that I was told by a gun smith who does a lot of swat weapons and has a contract with Macdill air force base you can google him, his name is Bruce Dow of a&b Dow or Dow arms room I will trust him. As for anyone else you can do what ever you like and maybe you can be the first to have a documented failure, not that I wish any harm to anyone it is a free country and we are all free to think and do whatever we want, we all just must be ready for what the consequences of our actions are.:D:D:D:D:D

Grandpatime
February 2, 2010, 11:04 PM
Maybe micdilly was mis informed then passed misinformed opinions on to you?

jkohler
February 3, 2010, 12:43 AM
you could be right i think i am but i have never tried to fire 7.62x51 out of .308 and will never do so dont mean to sound rude just what i think good luck to all

uncyboo
February 3, 2010, 11:20 AM
it is a free country and we are all free to think and do whatever we want

Yes you are correct everyone is entiltled their opinion. The problem comes when folks take their opinion and pass it on as fact.

maybe you can be the first to have a documented failure

I think after 60 years of shooters interchanging these 2 rounds I'm pretty safe. If it was that detremental the debate would be over, as those that oppose interchanging of .308 / 7.62 x 51 would have a ton of documented evidence.

MTT TL
February 3, 2010, 11:57 AM
maybe you can be the first to have a documented failure

That would be something. :rolleyes:

It has to do with people repeating the same bad information. Someone may one day have a rifle blow up but won't be because they used 7.62 in a .308 rifle.

tINY
February 3, 2010, 01:54 PM
Maybe that's how the recoil lug on my 308 model 7 cracked... Shouldda never fired the Aussie surplus ammo out of it...

:p


-tINY

azredhawk44
February 3, 2010, 01:59 PM
the 7.62x51 case is a little larger than the .308 check specs online you will see

Not quite... the 7.62x51 CHAMBER is longer on military rifles and light machine guns, than a gun chambered for .308 winchester.

The cartridges themselves are identical. There are some metric/sae conversion differences on various graphs and charts out there, but we're talking less than a thousandth of an inch here and there. Nowhere critical. Some slight differences on the extractor groove to give the x51 a stronger rim than the .308. Stuff like that.

The x51 has a longer potential headspace to give automatic rifles greater clearance after high volumes of fire and carbon build up.

azredhawk44
February 3, 2010, 02:01 PM
OP: Your ammo sounds like actual decent Federal ammo.

My experience with Federal has been less than pleasant and I get very few firings out of the brass.

But, my Federal ammo was not XM762 like you have... it has been Fed retail stuff without a properly annealed neck.

I've got some fantastic MagTech stuff that is annealed like you have. I love it. It shot great at first, and it shoots great when reloaded.