Cast my own shotgun slugs for 12gauge, turn bird shot into low recoil slugs for target purposes.
$30 for 100 birdshot shells turned into slugs, with just $50 invested in casting equipment.
30 cents a slug!!!!!!!!!!!
Then I've got all the hulls I can reload completely afterwards and save even more.
If you want to shoot a LOT and spend very little you have to put a bit of time and effort into it.