I have heard of Remington #97 primers, #57 primers (have some of these), I now have 300 #69 primers, they mic close to a 209 but have an open flash hole...does anyone have any idea what these were designed for..the slips are in great shape, probably worth more to a collector than the primers....
Remington #69 primers are the same diameter as the #57* primers and will not fit modern shotshell hulls.
Hulls for those primers were discontinued in the early 80's and few examples of them exist today in any quantity. Those primers were explicity made for use in the 410.
Soak them in oil to deactivate them and then bury them a foot or so deep and let them decompose over time.