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Pastimes : Don't Ask Rambi
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To: nihil who wrote (20057)3/24/1999 12:26:00 PM
From: Jacques Chitte   of 71178
 
All else equal - a heavier projectile exits with lower energy but greater momentum. Recoil is a momentum effect.
A longer barrel in the same chambering decreases felt recoil even though muzzle velocity goes up. Here's the key to this paradox.
Recoil is the sum of kickback from two types of reaction mass. 1) the bullet, and 2) the exhausting gas from the powder (muzzle blast). Item 2 contributes a good deal to felt recoil because while powder gas mass is less than bullet weight, its escape velocity is as high as 5000 feet per second. Thus the mass x velocity term is significant. In a short barrel, there was less time to transfer momentum from the charge to the slug.

Also a longer-barrelled arm is heavier, converting recoil impulse into a lower and more manageable backward velocity. A shove is more tolerable than a punch - even if they are equimomental.
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