Hi,
I have began making a range of catapult lead ammo moulds, they are CNC machined from aluminium bar rather than cast from aluminium so the results are more accurate.
I am currently selling them on eBay at £17.99 each.
Take a look at the current range here: http://www.ebay.co.uk/sch/heathertrudy/m.html?_nkw=&_armrs=1&_ipg=&_from=
To help you decide on a size each mould listed includes the approximate weight of the lead balls they make.
Bean shaped mould also available with more size coming soon.