Comparitors
The name says it all! You cannot use one to measure "absolute" values. I have several 17 cal "comparators" and they are nowhere near the same, or at least not closer than 10 thou. This is because the measuring hole is beveled slightly, and not the same between units unless you are very lucky.
The idea works great, but the measurements you make and record in your reloading log MUST be with the same piece!
Alex
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