Putting “match” on the box is an indication that they are guaranteed to be more consistent than non-match. The process if making primers is (or was) an off-line operation where operators added the priming compound to the cup. When they had their “best” operator do this they’d add “match” to the product and charge a bit more money for the primers. It really doesn’t mean much of anything. There are a couple of good videos out there showing how primers are made.
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