Does anyone have a good, common, readily available source of ammo for a 3.5" bore cannon? Short of buying a mold and pouring lead/zinc, or buying premade balls, I haven't found that just right item. My previous cannon used a pool ball for an excellent fit, flight, and could withstand the shock. I poured concrete into PVC and they disintegrated. The closest I can think of is a small bocce ball (84 mm) that i can get for around 6 for $30. I don't know how they will hold up. Thanks for your ideas.