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I encountered this at Mauser MG 213: a metric case designation. I expect it's commonplace, so I wondered: is there a way to use the convert template to produce a metric designation without the "extra" unit? That is, not this: 9 mm × 25 mm (0.35 in × 0.98 in)? TREKphilerany time you're ready, Uhura 16:42, 21 July 2015 (UTC)
It is far more complicated than you think, and a formulaic Metric <-> Imperial conversion will almost never yield a "correct" result that would mean anything to anyone looking for firearms information. For example, the 9mmx25 is simply never referred to in Imperial units, only Metric. And which "9mmx25"? The 9mmx25 Super Auto G? 9mmx25 Dillon? 9mmx25 Mauser? — Preceding unsigned comment added by 126.96.36.199 (talk) 12:24, 18 September 2015 (UTC)
Agreed. Wacky complexity. Bullets of .38 special and .357 magnum cartridges have the same diameter—What a country! Of course, in America, you choose bullet, but in Soviet Russia, bullet chooses you! — ¾-10 01:49, 24 September 2015 (UTC)