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<blockquote data-quote="ObiWanKannoli" data-source="post: 3076179" data-attributes="member: 116692"><p>The rifle in your hands, in terms of recoil, is like a fulcrum. If you are applying the same force on the object that moves about the fulcrum in a position close to the fulcrum and far away then the force applied closer will cause a great movement of the object about the fulcrum. Shorter barrels, for this reason, produce more "felt" or "perceived" recoil even if the actual force is the same. The ME of the projectile increasing or decreasing due to increased or decreased speed at a fixed weight does not impact this. The sudden expansion of gas at the end of the barrel is what causes the muzzle to rise, recoil, etc. If you have the same weight bullet and the same powder charge in the same caliber, the force at the muzzle will be equal as the available fuel for combustion is the same as is the pressure inside the system. The bull exiting only has more muzzle energy because it has more time in a sealed tube to accelerate and take full advantage of the peak pressure in the barrel. When we talk about muzzle energy, that is the energy that the bullet would hit something with if it impacted at the muzzle. Not the actual force acting upon the muzzle. That force will be more felt in the shorter barrel as it is acting on the system closer to the fulcrum, and in addition to that the shorter rifle is likely of lighter weight causing even less resistance against that force.</p></blockquote><p></p>
[QUOTE="ObiWanKannoli, post: 3076179, member: 116692"] The rifle in your hands, in terms of recoil, is like a fulcrum. If you are applying the same force on the object that moves about the fulcrum in a position close to the fulcrum and far away then the force applied closer will cause a great movement of the object about the fulcrum. Shorter barrels, for this reason, produce more "felt" or "perceived" recoil even if the actual force is the same. The ME of the projectile increasing or decreasing due to increased or decreased speed at a fixed weight does not impact this. The sudden expansion of gas at the end of the barrel is what causes the muzzle to rise, recoil, etc. If you have the same weight bullet and the same powder charge in the same caliber, the force at the muzzle will be equal as the available fuel for combustion is the same as is the pressure inside the system. The bull exiting only has more muzzle energy because it has more time in a sealed tube to accelerate and take full advantage of the peak pressure in the barrel. When we talk about muzzle energy, that is the energy that the bullet would hit something with if it impacted at the muzzle. Not the actual force acting upon the muzzle. That force will be more felt in the shorter barrel as it is acting on the system closer to the fulcrum, and in addition to that the shorter rifle is likely of lighter weight causing even less resistance against that force. [/QUOTE]
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