Take a piece of fired brass and run it through a sizing die.
Use a dremel or hacksaw and cut a long slit across the neck, down most of the way to the shoulder.
Clean up any burrs on the brass.
You now have a poor man's COAL gauge. Insert bullet into slotted case, insert case into barrel, close bolt, slowly eject and measure. Pull the bullet out of the case with your fingers, repeat 4-5 times, and you should be able to use the average.
Perhaps not the "best" method, but it works...
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