That's a very open ended question. It depends on how you rate power. It can be rated in feet per second(FPS) Muzzle velocity, largest grain bullet, ect,ect, I would say the .50 BMG it is the largest shoulder fired rifle used by... see the full page
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What is the one with the highest horsepower rifle (a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves - "rifling" - cut into the barrel walls)?
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