From LSWiki

Class: Ranged Weapon Skills
Attribute: Perception
Pedagogy: Physical Training

The ability to use slings, including weapons incorporating them such as hoopaks, 
in ranged combat. When using such a weapon, this skill influences the speed, accuracy, 
and effectiveness of your attacks, as well as how quickly you can ready another stone 
or bullet.

Trainers

Losthaven: Pryderi
Kolond: Duthien (only trains dwarves)
tlaxcala: Axton
Association:
Losthaven Guard: Captain Jonathan Tredwel
Guild:
Verynvelyrae: Sirinil
Quest:

Notes