Just wondering why some calibers get popular and some are nothing more than a footnote in history?? It seems most military cartridges become popular for sporting... Why didnt any of the Japanese ones become adopted? I remember when it was impossible to find anything but surplus x54, but because the Mosin is cheap and popular they started to make it. I been told there was a time when Arisakas were plentiful and even cheaper, but for years only Norma made brass or ammo for them. I understand why 8mm Mauser is popular, but why are the 6.5 and 7mm versions too? Arent only Swedish ones 6.5? Spanish and Mexican ones in 7mm? Ive never even seen a Swedish or Spanish Mauser, but apparently their popular enough for the ammo to be carried in stores.... Why is 40 S&W easier to find than 10mm? .38 Spl. and .357 Mag seem to be equally popular.. Why hasnt the 9x23 Mag ever really taken off? .... Why do calibers like .327 Mag and .356 TSW just disappear?