I used to actually melt down my own lead, and pour it into any size aluminium round containers I wanted, cake tines were good for this.
Then drill the appropriate hole size, it did work quite well actually.
Did it in the shed on a small gas two burner barbecue using a very heavy, deep old fry pan, and plenty of ventilation.
When ready I would ladle the lead into the hot mould on the other side of the gas burner, put in what I needed and turn it off to cool
worked a treat
Leon