The Sling: cap paul style paracord and leather - also paracord and 3d printed rubber
The Ammo: stones, tennis balls, sock balls shaped clay, pinecones - hell anything that will stay in the pouch
The Style : different styles for different purposes
The Task : distance, target, Balearic competition, dog walking, < that lot
The Area: favourite would be apebble beach. As i live as far from a beach as it's possible to get in the uk - generally the surrounding fields and woods.