Learn me sumtin .223 vs 5.56mm


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Old 02-04-2011, 04:36 AM   #1
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Default Learn me sumtin .223 vs 5.56mm

Ok just starting to look into the AR platform and I'm looking to be educated here.I see AR's chambered in .223 and 5.56mm. I also see .223/5.56mm.

Now it's my understanding that 5.56 round has a higher pressure than a .223 round. So it is not safe to fire 5.56mm in a .223 chambered AR. While you can fire a .223 in a 5.56mm chambered gun but with less accurracy. Is this correct?

What do most of you guys shoot?



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Old 02-04-2011, 05:33 AM   #2
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You're absolutely right, Smitty. Most recent ARs are chambered in 5.56 NATO so they fire 5.56 and .223.

Most of the ammo I fire is cheap steel case, Wolf, Tula, Herter's, whatever's on sale. Same goes for the brass cased stuff, what's on sale. So that's 55gr .223, I'm zeroed for it and use it.



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Old 02-04-2011, 01:12 PM   #3
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just make sure your barrel is chambered for 5.56 and you can fire both safely.

its kinda like 38special and 357magnum. i see no reason for the existence of 38 special chamberings. same with AR15 no reason for .223 chamberings.

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Old 02-04-2011, 01:46 PM   #4
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just make sure your barrel is chambered for 5.56 and you can fire both safely.

its kinda like 38special and 357magnum. i see no reason for the existence of 38 special chamberings. same with AR15 no reason for .223 chamberings.
Do the competition guys shooting heavy .223 ammo prefer .223 chambering.
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Old 02-04-2011, 11:05 PM   #5
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I go with the .556 so I can shoot anything and the accuracy is not to bad either.

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Old 02-04-2011, 11:08 PM   #6
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Do the competition guys shooting heavy .223 ammo prefer .223 chambering.
The bench shooters do prefer a tighter chamber.
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Old 02-04-2011, 11:22 PM   #7
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Jon, I know this is off-topic, but there are a few snubbies for .38spl that are different (shorter) than .357's. S&W 640 in .357 has a 2.25" barrel and the 642 in .38spl has a 1.875" barrel. Since I would never fire .357's out of a snubbie anyway, I'd rather have the shorter barrel (and do).

.223 chambering lives as a target tackdriver these days.

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Old 02-04-2011, 11:29 PM   #8
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The bench shooters do prefer a tighter chamber.
I also like a tight chamber
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Old 02-04-2011, 11:31 PM   #9
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I also like a tight chamber
That's why I am gonna call you "mjskeat"
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Old 02-04-2011, 11:33 PM   #10
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That's why I am gonna call you "mjskeat"
.........


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