7.62×51 NATO / .308 Winchester
The default full-power rifle cartridge of the West: a short-action .30 calibre that shoots everything from 147 gr ball to 200 gr subsonic, and the reference case for understanding transonic limits.
7 loads
5.56×45 NATO / .223 Remington
The small-calibre high-velocity standard: light bullets at over 900 m/s, a twist-rate history that explains more about ballistics than any other cartridge, and a very short supersonic life.
6 loads