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[–] 1 point 2 days ago* (last edited 2 days ago)

It's a pretty heavy mix, many of the most popular rounds are also referenced by their metric size but they're not usually 'useful' sizes in either standard or metric.

For example:

  • .22 LR = .223in = 5.56 NATO
  • 9mm = .357 mag
  • .40 S&W = 10mm Auto
  • .308 = 7.62mm
  • .44 = no common metric eq.
  • .45 = no common metric eq.
  • .50 = 12.7mm
  • source
  • parent