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Coal is measured from tip of bullet to base of brass with a caliper or mic (if you have one big enough).
All these new gadgets to me are more aggravating than they are worth. If I want to know where a particular bullet touches the rifling I smoke a bullet and put it in the rifle in a case where I have sized about the first 1/32ned of an inch of the neck. Much simpler and quicker than using all these new gadgets designed to complicate something simple.
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