Posted by Deutz Lover on December 19, 2015 at 21:50:39 from (70.193.162.210):
In Reply to: Question on ammunishin posted by Robin Hood on December 19, 2015 at 11:36:40:
The basic difference between the two is maximum pressure and throating. Some people arguably use the terms throat, leade, and freebore interchangeably. I am not getting into this semantic can of worms. Someone else can if they care to.
The miltary 5.56 is loaded to a higher pressure.
The throat/ leade of a 223 Remington rifle is shorter than that of a rifle chambered in 5.56 Nato. Some commercial rifles in 223 Remington may have been reamed to the 5.56 throat length to allow use of the Nato cartridge, but they should not be used unless the rifle is checked for this modification.
There is a third option. Some of the newer rifles are being offered in a 223 Wylde chambering which has been designed to safely use both cartridges. This is probably the best option. A 223 Wylde reamer might be used to rethroat a 223 Remington but I am not sure.
You cannot use a Wylde reamer on a 5.56 Nato chamber because the throat is already longer than the Wylde throat. That would require shortening and rechambering the barrel.
The funny thing is that the standard Ar15 magazine won't allow the use of longer cartridges that come close to touching the rifling on a Nato chamber. This was at least true on the rifles I checked.
While there is a difference in 7.62 Nato and 308 Winchester case weights and dimensions, there is really no major differences in 223 Remington and 5.56 Nato case dimensions and weights.
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