If we rule out full auto or even semi combustion powered weaponry, we're still left with two groups of weapons.
-Sniper Rifles (bolt action)
-Shotguns
The added power of combustion might allow for shotguns to easily fire large amounts of BBs for each pump - something alone which would push me to buy a shotgun.
The possibilites for sniper rifles are self explanatory.
-Cheese
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