What does 5.56 x 45mm mean?

[Tehgregzor 10+ year member]

So i'm doing a report on the doomed XM8 weapons family for my military history class. I'm just now becoming interested in weapons in general, and i don't understand what those numbers mean in a ammunition specification. I tried to Google it, but no website i've found shows a breakdown of the definition of 5.56 and x 45mm?

Can anybody provide any insight? Thanks alot!

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[PhatTonyDeMarco 5,000+ posts]

I am not positive, but I would speculate that the 5.56mm would be the diameter of the slug, and 45mm would be the overall length of the slug and shell.

 

[Bender. 10+ year member]

I am not positive, but I would speculate that the 5.56mm would be the diameter of the slug, and 45mm would be the overall length of the slug and shell.

yep

 

[Annnarbor84 5,000+ posts]

Nato round

 

[azimuth 5,000+ posts]

sign up here

http://www.geekswithguns.com/modules.php?name=Forums&file=viewtopic&t=677

 

[IDSkoT 5,000+ posts]

I am not positive, but I would speculate that the 5.56mm would be the diameter of the slug, and 45mm would be the overall length of the slug and shell.

This.

 

[Annnarbor84 5,000+ posts]

.223 round if I am not mistaken

 

[Ken448 10+ year member]

means its gonna hurt if it hits you for the full 45mm length and then some

 

[Tehgregzor 10+ year member]

Thanks alot guys!

 

[aquafbody 10+ year member]

So i'm doing a report on the doomed XM8 weapons family for my military history class. I'm just now becoming interested in weapons in general, and i don't understand what those numbers mean in a ammunition specification. I tried to Google it, but no website i've found shows a breakdown of the definition of 5.56 and x 45mm?
Can anybody provide any insight? Thanks alot!

5.56 is the nato designation for the .223 5.56 is metric and .223 is two hundred and twenty three thousands of an inch. but a .223 is actually .224 in diamiter

 

[aquafbody 10+ year member]

Oh and for those who don't care I'm an actual gunsmith I actually have a digree and not just some jack *** with a can of Bore Kleen and percision screwdrivers. PM me if you have any work or even questions. I love the subject and I love educateing people on the subject.

 

[deLeo 10+ year member]

Oh and for those who don't care I'm an actual gunsmith I actually have a digree and not just some jack *** with a can of Bore Kleen and percision screwdrivers. PM me if you have any work or even questions. I love the subject and I love educateing people on the subject.

you have a degree you mean //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[aquafbody 10+ year member]

you have a degree you mean //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

lol never said I could spell.

 

[azimuth 5,000+ posts]

Oh and for those who don't care I'm an actual gunsmith I actually have a digree and not just some jack *** with a can of Bore Kleen and percision screwdrivers. PM me if you have any work or even questions. I love the subject and I love educateing people on the subject.

know anything about gun law in colorado? specifically, the laws pertaining to ex-felons and firearms.

 

[aquafbody 10+ year member]

How long ago was it a D V or Assult tell ya what PM me.