The Army has played around with a 6x45 a couple of times, at least to the point of having prototype rifles and LMGs and some ammunition made.
Back in the mid-1960s various 6x45s did well in the varmint rifles of the day. The guy who ran Remington's custom shop, whose name I can't remember offhand, was quite fond of it.
I'm a major 6.5 fan, but the availability of 6mm/.243 bullets is equaled only by the .30 caliber.
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