Have you tried to sling them?

So I can report on durability, etc, the material is called "Marblex" Self-hardening Clay.  Not cheep, but I sprung the $7 for an experiment.  They're drying on a cookie rack on the kitchen counter.   We'll see about durability.

Interesting how easy they were to make.  1/ Moosh the clay all together, then make it into a sphere, by rolling it between my two hands.  2/ Using almost the same motion, roll the sphere into a sort-of football, then 3/ flatten the football with a sort-of back and forth hand motion to give the flattened almond shape, somewhat thicker in the middle.

With practice, I figger a person could form 2-3+ glandes per minute.    Makes it very likely ancient slingsters preferred using their own custom ammo over picking up the less predictable odd stone.   mgreenfield

Mgreenfield, the almond Roman glandes were made of lead and due to its small size they worked very well. The clay glandes of the antiquity were football shaped, of circular cross section, or at least I´ve not seen yet any clay almond shape proyectil. Really it is not necessary this shape for clay proyectiles due to its biger size and also because the clay have enough adhesion and clench to the pouch, that was the effect looked for with the almond shape little glandes, in regard to the glandes to take a good spin in the launching, in my opinion.