txtrophy85
Veteran Tracker
Reged: 08/12/05
Posts: 3273
Loc: San Antonio
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my new bushmaster M4 says .223/5.56 mm on the side.
i know that most bolt guns chambered for .223 should't be shot with mil-spec ammo, but is my gun cleared for take-off?
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Modern day head hunt er
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helomech
Extreme Tracker
Reged: 11/14/07
Posts: 4425
Loc: Latexo, tx
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Yes your bushmater can shoot the 5.56 with no problem. That is what it is designed for.
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txtrophy85
Veteran Tracker
Reged: 08/12/05
Posts: 3273
Loc: San Antonio
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good to know.
from what i hear that stuff is alot hotter than regular .223
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Modern day head hunter
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helomech
Extreme Tracker
Reged: 11/14/07
Posts: 4425
Loc: Latexo, tx
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It is hotter, but not sure how much. I have not been able to find good load data for the 5.56, I have just been loading on the hot side for the .223.
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Hooper21
Bird Dog
Reged: 02/22/07
Posts: 289
Loc: Parker Co.
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5.56 isn't necessarily hotter, but 5.56 chambers are reamed/throated to handle the heavier bullets, so firing a 5.56 in a commercial 223 chamber could cause trouble.
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westtexaswatkins
Tracker
Reged: 05/31/07
Posts: 736
Loc: Anton, TX
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Fire away, it will work fine.
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psg1954
Woodsman
Reged: 08/22/06
Posts: 208
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I think it is pretty much a bolt action concern. I know in my AR15 and Mini 14 both function flawlessly.
Need to get an upper for your M-4 stamped .50 Beo 
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txtrophy85
Veteran Tracker
Reged: 08/12/05
Posts: 3273
Loc: San Antonio
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Quote:
I think it is pretty much a bolt action concern. I know in my AR15 and Mini 14 both function flawlessly.
Need to get an upper for your M-4 stamped .50 Beo
wht good would that do????
is it a good hunting round?
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Modern day head hunter
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HWY_MAN
THF Trophy Hunter
Reged: 05/25/06
Posts: 5415
Loc: Howard County
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http://le.atk.com/pdf/223VS556.pdf
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"The American people will never knowingly adopt socialism. But, under the name of 'liberalism,' they will adopt every fragment of the socialist program, until one day America will be a socialist nation, without knowing how it happened."
- Norman Thomas, U.S. Socialist Party presidential candidate 1940, 1944 and 1948
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psg1954
Woodsman
Reged: 08/22/06
Posts: 208
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Quote:
Quote:
I think it is pretty much a bolt action concern. I know in my AR15 and Mini 14 both function flawlessly.
Need to get an upper for your M-4 stamped .50 Beo
wht good would that do????
is it a good hunting round?
Very similar ballistics to the 45-70 but with a .50 bullet out of your M-4. Probably the best hog round ever made. It's also the most fun you can have in a black rifle.
Future Weapons episode about it.
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yukons95
Bird Dog
Reged: 05/28/07
Posts: 443
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Start looking for terrorist!!!! No problems at all!!!!
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LlindeX
Bird Dog
Reged: 06/01/07
Posts: 348
Loc: Colorado
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In answer to you'r original question:
The 5.56mm chambers are throated slightly longer to allow the use of the 62gr. & larger bullets. The throat on a commercially chambered .223 Rem. is shorter. Thus, firing commercial .223 Rem amunition in a 556mm chamber is ok. However, 5.56mm mil surplus rounds fired in a commercial .223 Rem chamber can often result in extremely high pressures. If you have any doubts about what chamber you really have, check with a gunsmith about your specific rifle.
Regards, & Good Shootin',
LlindeX
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Rack-N-Rod for Portraits of Your Game Animals
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