you have black powder in your cupboard do you not???? equal measure of powder and shot...with wads to fill rest of case...another wad on top glued into place job done.....
in metallic case it will be childs play to a clever chap like yourself.
trick with .410 whackamole is columb height is critical ...an overshot card wad helps no end... in break open gun you will get away with some crude looking crimps.
if youve got lilgun no issues win 296 was other powder I used... I didnt find any issues just had two loads one for 3" and another for 2 1/2" and my 3" had 3/4oz shot the shorty 1/2oz
dont overthink it..its not hugely high pressure to begin with and your metal cases give you more strength again.
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