.223 Remington is to 5.56x45 .......

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Jim Bowie

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Just making a list of similar cartridges.
Another one would be 7.62x25 and .30 Mauser.
Just a fun mental exercise...
 
This list is going to get real long.....

9mm Luger
9mm NATO
9mm Parabellum
9x19
There’s a few more

Now who wants to try .380?
 
.358 Winchester == 9.1x51mm. But you have to be French or better to say it with a straight face.

9x19 = 45 ACP
I've tried that. They won't even feed from the magazine.

Now .380 Court works in a 9x19 most of the time, and 9x19 works in a .40 Short'n'Weak surprisingly often.
 
While the same outside dimensions of both sets of cartridges: 7.62x25 - .30 Mauser; 5.56X45 - .223 Remington; both are loaded to different pressures and NOT necessary interchangeable. 7.62x25 and 5.56X45 are normally loaded to higher pressures.

Good Luck

Jerry
 
Why does this fallacy pop up all the time?

THIS is why firing 5.56 in a .223 chamber is not a good idea:.

What you stated is spot on, period.

Any thoughts or opinions on the Wylde chamber? I have a couple of Barnes BPMs with the Wylde chamber which are really quite accurate with either .223 or 5,56.
 
The Wylde chamber is the best compromise between 5.56 and .223; still accurate for precision work, and can digest 5.56 without a hiccup or worries about pressure. When I get a 16" or 20" upper for my AR pistol, it will have a Wylde chamber.
 
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