> Select a basic " High Brass " 12 Bore bird shot cartridge , which possesses a card board top wad .
> Remove the top wad and pour out the bird shot .
> Melt the lead bird shot and pour the mass in to a 16 Bore sized spherical ball mould .
> Take the hardened spherical lead ball and re load the cartridge .
> Replace the card board top wad .
