My issue just arrived with an article by Jarrett Lobell, "Pieces of History"; On one of Britain's most famous battlefields.
Early gun fragments hint at a new style of warfare. Pieces of cast bronze cannons were analyzed and shot constructed with a cast iron cube for a core, contained in a poured lead shell. Lead spattered upon impact but with this construction, the iron kept on going to smash what it hit.
You may be able to raise the issue with
http://www.archaeology.org/rc