modify the RPG maybe?

[Captain_Bravo]

Just have two settings "Range" and "Yield". Range fires a rocket that can travel 2-3 screens, and does a small explosion with a little shrapnel. Yield rockets only travel a short distance before they automatically explode, but have a bigger blast and more shrapnel. Fluff it away as saying that the setting adjusts how much of the explosive is used for propellant, and how much is used for detonation.