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7 x 57 mm Mauser weighing 10 pounds. Projectile weighing 140 grains with a muzzle velocity of 2700 feet per second. Powder charge weighing 42.5 grains with a powder charge velocity of 5200 feet per second. The online calculator I have been cheating with gives approximately the same result: Recoil Energy of 11 foot pounds, and Recoil Velocity of 8 fps. |