Discovered that normal rocks count as a heavy projectile, usable on the slingshot cannon.
In terms of stats, the rock has only 15 damage over the lead ball’s 50 damage, and some dispersion. Due to my survivor’s marksmanship skill (17 at this point), and a level 7 in launchers, the rocks still can do up to 200 damage. Less likely from far away, but about 20-30 tiles or less it’s reliable.
Rocks, as an ammo, is rather OP. 'course, at less than 30 tiles away and with several zombies running toward the survivor, you only get a few shots before they get close.
Anyway, is there any way to find out if there are other items that can be used on the slingshot cannon? The category of the ammo is heavy projectile, and I’m curious if there’s other stuff that can be used.