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410 was left as option for kids...and the few older shooters who used them..MOST (I would guess 99.9%) of .410s in the country 10 years ago were either single or doubles...
when the 20ga was exempt...

my bad..the other option...slightly lighter than lead....starts with B??? bismuth???
dont touch your choke....tighter the better in .410 as small payload means 25 yards is about it...open chokes and...

buy a box of super expensive .12ga heavi shot..rob the pellets and make 2 and a bit boxes of .410 ..not hard to refold crimps by hand,add dob og glue if necessary,break open guns very forgiving....