The headspace specs for the .270 Winchester cartridge are identical to the .30/06 and so is the .25/06, the .35 Whelen, and the semi wildcat .338/06. I believe you may be thinking of the .280 Remington which has the shoulder moved forward .050" to prevent forced chambering in a .270 rifle.
Hey ArtPahl,
I was thinking in .270
Regards
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