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Old March 12, 2013, 11:13 AM   #10
Senior Member
Join Date: September 27, 2004
Posts: 4,811
It seems you're a bit confused.
OAL is total length stem to stern & so you don't need anything other than a caliper to measure that.
Measuring devices like comparitors are used for measuring things like Length to ogive, ot headspacing on rimless cases.

What are you actually trying to measure?
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