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To: nihil who wrote (20057)	3/24/1999 4:42:00 PM
From: Ish	Read Replies (1) of 71178

<<Isn't the explosive force completely dependent on the powder and the speed of combustion? i.e. independent of the mass of the projectile? The more massive the projectile, the lower the velocity caused by a given charge. I think. >> You think right. The explosive force is independent of the mass of the projectile. However the recoil is mostly dependent on the mass of the projectile. Load three muzzle loading rifles with 95 grains of FFg powder. Load a paper wad in one making it a blank - no recoil. Second load a 150 grain miniball and you will feel recoil. Third load a 300 grain maxiball and you will feel even more recoil. The three explosions are identical. The explosion creates equal force in all directions. The sides cancel each other as does the top and bottom. With the blank there is no restriction at the muzzle end, so 0 pressure and the opposite reaction is the recoil which is 0. With say the 300 grain Maxi you are building about 1600 foot pounds of energy and the opposite reaction is the recoil. Now that is spread over the entire time the ball is in the barrel and absorbed by the weight of the gun overcoming inertia so the felt recoil is probably about 10 foot pounds.

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