Ok thanks again :D
Now one (hopefully last) question:
Would it be possible to let the amount of ammo you get depend on what weapon you have, so, when there is two weapons that need the same ammo, one of them would get 10 and the other one 20?

I noticed myself alread :P, thanks anyways!
BTW, if I pick the ammo up now it prints #airboatgun_ammo or something similar, how to change this?

I have been experimenting with making some new weapons for TTT and now I would like to create new ammo for some of them.
So I made a new folder in the correct place, grabbed myself a default ammo file, changed it a little (I think  ENT.AmmoType = "sg550" (= a non existant ammotype) might cause the problem) and saved it.
After that I changed the SWEP.Primary.Ammo and SWEP.AmmoEnt to the correct type in the weapon lua and went to test it ingame.
Ingame I experience that when I walk over the matching custom ammo for my weapon, the ammo disappears and nothing else happens.

Any info on this would be appreciated!