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rmcmahanP345 12-08-2012 03:39 AM

AR-10 build
 
Question....What is the equivelant Nato round to the .308? For instance, .223 has 5.56. On a CMMG stripped lower, it is marked 7.62, so would it be 7.62X54 or 54R?

kytowboater 12-08-2012 04:01 AM

7.62x51 is .308

rmcmahanP345 12-08-2012 06:45 AM

How readily available is 7.62X51? Would it be better to stick with the .308 because of availability?

kytowboater 12-08-2012 10:50 AM

Get an upper chambered in 7.62x51, then you can shoot both the 7.62 and .308 rounds. Both seem plentiful.

locutus 12-08-2012 02:46 PM

7.62X51 NATO is the standard cartridge of both M60 and M240 general purpose machine guns.
It's also used in the M21 and M40 sniper rifles.

There's tons of it around, but it isn't cheap.

rjgnwdc 12-08-2012 03:22 PM

We reload, all the components you need for 7.62 Nato / .308 are available everywhere.

FullautoUSA 12-08-2012 11:01 PM

Quote:

Originally Posted by rmcmahanP345
How readily available is 7.62X51? Would it be better to stick with the .308 because of availability?

.308 and 7.62x51 are the exact same thing

JonM 12-09-2012 12:53 AM

Quote:

Originally Posted by FullautoUSA (Post 1044665)
.308 and 7.62x51 are the exact same thing

Quote:

Originally Posted by kytowboater (Post 1043735)
7.62x51 is .308

they are not the same.

308 is not safe to shoot in a 7.62nato chambered firearm. the lead on the throat in the 7.62nato is much shorter than a 308winchester chamber. longer ogived bullets you find in some off the shelf ammo can cause dangerous overpressure levels in a 7.62nato chamber.

its the same difference as 556 and 223 except the civvy version in this caliber is the more versatile chambering.

if you have a 7.62nato and the owners manual doesnt say it is safe to use 308winchester do NOT use ammunition off the shelf for 308winchester in it. stick with 150grain bullets or less. if you reload and want to use heavier bullets in a 7.62nato you need a chamber gage of some sort like the hornady locknload bullet comparator and chamber gage so you can find the proper lead from the ogive.

asmith2690 12-09-2012 11:51 PM

Quote:

Originally Posted by kytowboater
Get an upper chambered in 7.62x51, then you can shoot both the 7.62 and .308 rounds. Both seem plentiful.

Isn't the .308 a higher pressure round than the 7.62 meaning you should buy the .308 in order to shoot both? I could be wrong but I thought I read this somewhere just making sure

JonM 12-10-2012 04:11 AM

Quote:

Originally Posted by asmith2690 (Post 1045903)
Isn't the .308 a higher pressure round than the 7.62 meaning you should buy the .308 in order to shoot both? I could be wrong but I thought I read this somewhere just making sure

Same pressure curve. 308 chambers are longer in lead than nato so some hunting off the shelf ammo can cause over pressure from the bullet ogive too far forward coming into contact with the rifling when chambered in a 762 nato gun. You can have a gunsmith cut a nato chamber to 308 spec then its not an issue


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