.275 (Rigby) is actuallly...
the Standard System measurement of the diameter of the lands. The diameter of the grooves is .284, which is much more recognizable as 7 mm.
Speaking of .284, no one has yet mentioned the .284 Winchester, one of the earlier 7 mm short/fat rounds. It was notably necked down to 6.5 mm (.264 inch) and became the 6.5-.284, a very accurate long range competition round.
I'm just saying.
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