I use a .260 Lee case length Guage for my 6.5prc with a magnum shell holder. I tested a case and measured first before doing all cases.
Also I use a .243 Guage shortened down for my 6mm Creedmoor. Tested for trim length with the calipers also.
So I think you could use the 7mm08 guage. Might have to shorten it slightly looking at the cartridge specs Kelton posted.
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