well these cases are built off the 308. 22 jaybird, 243, 25 souper, 260 rem, 7mm/08, 338 federal, and 358 win. so I'm sure the 270/308 has been done, just can't tell you the exact name without looking.
You may not know or believe this, but when a new cartridge is introduced, there are guys who for a hobby, wildcat into every possible form they can think of, even before factory rifles are available in the parent chambering.
RR
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