How to Use Gangplank Barrels vs Ranged Champs

1. Drop a Powder Keg somewhere safe
2. Wait until the first keg drops to one health
3. Drop another barrel in range of the first and on top of the champ you plan on blowing up
4. Parrrley the Keg for tons of damage

One trick to prevent counter play by the opponent is to wait for the barrel health to tick once, and while it is at two health, auto attack it, place a second barrel, Parrrley the first one.