Flip vs Recoil

Yuk

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What causes a pistol to flip vertically as opposed to recoiling horizontally? Expressed another way, why would a 38 oz. 9mm, with a 5 inch barrel flip, when the same pistol in .45 cal. recoils?
 
Are you referring to energy and velocity?

I notice that a 124gr 9mm "feels" quick and snappy-straight back/up (flip?), whereas a heavy 230gr .45 will "feel" like it's rotating/twisting in the hand.

I prefer the latter. :)
 
Because the barrel where the force is coming from is above your hands BOTH guns do a combination of some flip AND some recoil. THe higher the barrel the more it'll seem like a flip. But make so mistake. A .45 1911 had a goodly amount of both flip and recoil.
 
Muzzle flip with a service pistol is the result of an improper shooting technique because typical service pistol cartridges do not generate enough recoil to generate muzzle flip when a proper grip is applied. Muzzle flip occurs when the pistol is held with the hand low on the grip frame. Next time you are at the range, fire a couple of rounds with your hand low on the grip frame, then try a couple more rounds with your grip adjusted so the web of your hand is tight against the tang, and you will find the latter provides much more control, allowing faster target acquisition, and faster aimed repeat shots.
 
9mm's feel somewhat more snappy because the lighter bullet accelerates faster (less inertia) the 45 bullet (twice the inertia) accelerates more slowly, therefore it's more of a push. As for the torque effect, that's because the greater inertia and surface area of the 45 bullet impart more torque to the barrel - it converts the energy to torque as it searches for the path of least resistance. As shooters, our job is to provide it no path of least resistance.
 
"...What causes a pistol to..." Physics. Both of 'em recoil. Recoil goes in opposite the direction of the bullet. It cannot go horizontally. Both have a certain amount of muzzle jump too.
 
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