If you want the clay more "shatter'i" mix some sand with itI tried clay and have mixed emotions. That I bought from Dankung is amongst my favourite ammo. The earlier clay was cheaper than what the sell now. Fortunately I haven't had to resupply as I stocked up well. The earlier, and I assume is still the same, shattered on impacting a hard surface making it safe in an urbane environment. I can shoot at a window pane with no damage to the window. I tried to make some and ordered clay from Amazon. Evidently I ordered the wrong clay. That made balls as hard as a rock, which is great for those wanting hard ammo. As hard as those balls were they were lighter for their size than I normally shoot, something that I didn't like. When I exhaust my current supply I think that I'll reorder from Dankkung. They work great for pest control and ricochets are none existent.
Gives some more wait and takes a bit of the long lasting out