AmmunitionThe simplest projectile was a stone, preferably well-rounded. Suitable ammunition is frequently from a river. The size of the projectiles can vary dramatically, from pebbles weighing no more than 50 g (2 oz) to fist-sized stones weighing 500 g (1 lb) or more.
Projectiles could also be purpose-made from clay; this allowed a very high consistency of size and shape to aid range and accuracy. Many examples have been found in the archaeological record.
The best ammunition was cast from lead. Leaden sling-bullets were widely used in the Greek and Roman world. For a given mass, lead, being very dense, offers the minimum size and therefore minimum air resistance. In addition, leaden sling-bullets are small and difficult to see in flight.
In some cases, the lead would be cast in a simple open mould made by pushing a finger or thumb into sand and pouring molten metal into the hole. However, sling-bullets were more frequently cast in two part moulds. Such sling-bullets come in a number of shapes including an ellipsoidal form closely resembling an acorn - this could be the origin of the Latin word for a leaden sling-bullet: glandes plumbeae (literally leaden acorns) or simply glandes (meaning acorns, singular glans).
Types of Sling
Soka (Halfling Sling)