CapnMac
Member
Yeah, 7.0mm has been around a long time. The Brits chased it with their 1912 .276 enfield (7x60 IIRC), but there was a war on, so they stuck with .303 for better or worse. If memory serves, Ross experimented with a similar .280 caliber.There were several such short 7mms in assault rifle development.
In the US we saw the .76pedersen (7x51), which was a zippy little round, which was totally unsuitable for use in MGs at 2500-3200m, unlike M2 ball.
The brits came back, after the war, and after considerable study of 8mm kurtz, with the .280NATO )7x43). That round tried to span the bridge of infantry rifle and Squad Automatic Weapon. Was good for the former, not so much for the latter. The US had begrudgingly determined that 7.62NATO was as intermediate as they could stand, so much for that 280.
Now, there is a very reasonable argument about what could a 7x40 or 7x45 do that a the 6.5creedmore does not do already. Only answer I presently have is in selection of heavy projos with favorable BC. Maybe. Perhaps. Sorta.