DocEd,

I believe the 280 is unique in its case length and headspace gauge. It is 2.199 to the neck/shoulder juncture and the 30-06 is 2.109. I don't think its headspace gauges are interchangeable with any other 06 based case. It was made a touch longer to prevent inadvertent chambering in the 270.

Mart

Last edited by mart; 09/20/14.
Chronographs, bore scopes and pattern boards have broke a lot of hearts.