Thanks for the tips! Labdien, Dan
I'll definately paint my distance projectiles some bright fluorescent colour. I'll give those egg sinkers a try too.
About ammo- i'm thinking boiled potatoes (carefully selected for size and shape)
You know, just so that they aren't completely hard and would squish when thrown at hard surface. The problem with tennis balls is that they aren't cheap, and since we'll be throwing from a cliff, retrieving ammo will be difficult. So throw-and-forget style ammo is best.
I guess i'll do some teching-tests of figure eight and apache styles on some of my friends and/or unsuspecting bystanders (maybe at the site of that event) and then i'll decide wich one is best.
One problem is that the event is taking place in Lithuania and my lithuanian doesn't really go beyond "hello" and "bye". Well, i've still got some 3 weks, so maybe i can quickly learn the needed words and phrases to teach figure eight: "keep your elbow in place" ; "stand with your left shoulder to your target" ; "release when the pouch is above your head" ; "OH MY GOD DUCK ROGUE STONE!!!!".
Reinis