What is the most powerfull repeater air rifle?

Answer 1

You will find several to select from. They fall in the PCP (PreCharged Pneumatic) Class of air rifles. Like the Benjamin Marauder .25 caliber or the 50 caliber dragonslayer.

These rifles and pistols require special equipment to charge them, like a Scuba tank or Special hand pump. Consider this: a regular C02 cartridge can charge the guns system to 80 PSI but a PCP rifle is charged to 3000 PSI and is capable of bringing down a boar. All the current Olympic match rifles are PCP rifles.