I just miked a 209 shotshell primer and I measure .240, not .209 inches.
Anyone remember when you had to buy #57 primers to reload Remington shotgun shells? They were smaller in diameter than the 209 primers that everyone else used in shotshells.
I have also heard that you could reload 209 primers by punching out the old primer from the battery cup and putting in a new large pistol primer. Probably more trouble than it's worth to save that penny of cost difference if it's indeed true.
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