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.505 Gibbs Bullet weight - 525 grs Velocity - 2300 fps Powder weight - 110 grs Gun weight - 11 lbs Recoil energy 78 foot pounds Recoil velocity 21 fps .600 NE Bullet weight - 900 grs Velocity - 1950 fps Powder weight - 110 grs Gun weight - 14 lbs Recoil energy 103 foot pounds Recoil velocity 22 fps Guesstimates on the parameters. |