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That works OK if you only have a single firearm in that caliber as you are forming your cases for a specific chamber, not for any firearm in that caliber. If you have multiple firearms in the same caliber like many of us do, then a Dillon or Wilson case gauge is a necessity.
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I completely agree. Plus, if you're running something like an AR where you have to snap the extractor over the rim, and have the tension of the ejector pushing on the case, how good of a reading are you getting.
A case guage lets you check your min/max case length too. There's no downside to having one.