Posted by MarkB_MI on December 19, 2015 at 12:25:41 from (70.194.8.133):
In Reply to: Question on ammunishin posted by Robin Hood on December 19, 2015 at 11:36:40:
5.56 WHAT versus .223 WHAT?
I'm going take a wild stab in the dark and assume you're asking about the 5.56 (mm) NATO cartridge, versus the .223 (inch) Remington cartridge. They have the same physical dimensions, but the 5.56 NATO is loaded to higher pressure than the SAAMI specs for .223 Remington, and there are some differences in the chamber dimensions between the two. It is generally a bad idea to shoot 5.56 NATO ammo in a rifle whose markings indicate it is chambered for .223 Remington.
If you are talking about the diameter of the barrel bores or bullets for the two rifles, they are identical. They both shoot a .224 inch diameter bullet in a barrel having a .224 inch groove diameter. As do a number of other cartridges, such as .220 Swift, .22-250, and .222 Remington.
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