Well the new rimfire cartridge is here and it is a smoking hot round: Â the .17 Winchester Super Magnum. Â The new rimfire promises “pinpoint accuracy” and the “downrange performance of a centerfire cartridge.”
Ok, let’s cut to the chase: Â the new Winchester cartridge is pushing a 20 grain bullet at 3,000 fps. Â That is an amazing feat for a rimfire. Â Energy measures right at 400 ft-lbs (399.6 if my math is correct.) Â A 25 grain bullet screams along at 2,600 fps for 375 ft-lbs of energy.