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Forgotten Weapons on MSNOpinion

How .223 and 5.56 became the most confused cartridges ever

For most shooters the difference between .223 Remington and 5.56×45 NATO is minor, but it matters because 5.56 is typically loaded to higher pressures and uses a slightly different chamber leade.
What if you wanted to have more than one caliber in a single rifle? The Primary Weapons System UXR rifle is the answer, and ...
This database originally covered cases from 1982 to 2012 and has since been updated and expanded numerous times. For analysis and context on this data—including how we built the database, and a change ...