Actually, since the bullet is rotating and it's passing through a fluid (i.e. air), it will curve somewhat ... that's called gyroscopic procression and it's a factor for long range rifle shooting. For pistol shots, the effect is negligible.
In addition, the bullet is always falling after it exits the barrel because it is always accelerating toward the Eath, so again it does not follow a straight line path (neglecting gyroscopic procession), but instead follows a parabolic path (within our frame of reference). That's basic projectile motion. Even for pistol, elevation issues can be a factor for precision shots once you get past 15-20 yards.
Now, the stupid-a** "curve the bullet" crap is going to do exactly what you mentioned: impart an initial horizontal velocity on the projectile. That just means it will hit to the side of where you "aimed," not that it will "curve." With the horizontal component considered by itself, the bullet will have a constant velocity in that direction (for which you can neglect wind resistance since the component of velocity in that direction is small), which will only make you miss the target.
It's like a backwards, ignorant application of what you do when you shoot at a moving target ... you swing with the target, leading it an appropriate amount, then follow through with the swing since the bullet (or shot load) is still in the barrel when you press the trigger. Applying the horizontal component of velocity to your projectile(s) allows you to compensate for the relative horizontal velocity of your target.
Did you say something about being a geek?
In addition, the bullet is always falling after it exits the barrel because it is always accelerating toward the Eath, so again it does not follow a straight line path (neglecting gyroscopic procession), but instead follows a parabolic path (within our frame of reference). That's basic projectile motion. Even for pistol, elevation issues can be a factor for precision shots once you get past 15-20 yards.
Now, the stupid-a** "curve the bullet" crap is going to do exactly what you mentioned: impart an initial horizontal velocity on the projectile. That just means it will hit to the side of where you "aimed," not that it will "curve." With the horizontal component considered by itself, the bullet will have a constant velocity in that direction (for which you can neglect wind resistance since the component of velocity in that direction is small), which will only make you miss the target.
It's like a backwards, ignorant application of what you do when you shoot at a moving target ... you swing with the target, leading it an appropriate amount, then follow through with the swing since the bullet (or shot load) is still in the barrel when you press the trigger. Applying the horizontal component of velocity to your projectile(s) allows you to compensate for the relative horizontal velocity of your target.
Did you say something about being a geek?
Actually...
The lateral movement imparted by the gun will cause a lateral movement in the bullet... as the bullet slows down the movement will become more pronounced. It's first semester physics.
Now, how much will the bullet actually "curve"?
Let's assume that a person can sling the gun sideways at 30mph. That's 44 fps.
Let's also assume that the bullet is travelling 1,000 fps.
Neglecting air resistance and gravity, the bullet will travel about 44 feet per 1,000 feet travelled (actually you would have to do some trigonometry, but the angle is small enough to ignore, and it's Saturday.)
So if you were shooting at a target 100 feet away (33 yards) the bullet would go 4.4 feet sideways.
However... the bullet does not curve... it still goes in a straight line (assuming no air resistance, which we will ignore with short shooting distances), it's just a straight line at an angle. If you include gravity and air resistance, the bullet will "curve" (not much), but again it's Satuday, and I'm not doing any calculus on Saturday.
Needless to say, you would still probably miss the intended target.
And it violates RULE #4.
... and now that everyone knows how much of a geek I am...