.38 special IS the correct ammo for a gun chambered in .38 special. Trying to take a round and push it into the barrel is not the way to "test" to see if it's the correct ammo because the cartridge or bullet won't fit into the barrel that way unless you force it. If the gun is a .38 special, you buy .38 special ammo and it will work.
bullet
The barrel guides and accelerates the bullet out of the rifle, and imparts spin to the bullet to stabilize the bullet in flight.
The barrel of the gun has lands and grooves (grooves and ridges) cut in a spiral. The bullet molds to these and starts to spin as it moves down the barrel. The bullet just continues to spin after it leaves the barrel.Correct. The ridges are known as 'lands'. It is possible to calculate how fast a bullet will spin if you know the twist rate of the barrel and the velocity of the bullet. My AR15 has a twist rate of 1-in-8 ie for every eight inches the bullet travels down the barrel, the bullet is rotated once. It fires a .223 round at approx 2,800 feet per second so... The formula is (bullet velocity x 720)/twist rate so... (2,800x720)/8 is an incredible 252,000RPM!
Yes, a bullet must be the same diameter as the barrel (unless it is a shotgun).
Depends on the speed of the bullet, and the length of the barrel. In the case of a .22 rifle, firing a bullet at 1200 feet per second, from a 16 inch barrel, it will take 1/75th of a second for the bullet to leave the barrel.
Time taken by a bullet to leave barrel is 10-3 Seconds.
The rifling in the barrel. These are grooves cut on the interior of the barrel that twist around and cause the bullet to spin as it passes down the barrel. The spin stabilizes the bullet and promotes accuracy.
Barrel contains the force of expanding gasses, as it pushes bullet out of the barrel.
The gun barrel is the metal part that the bullet comes out of.
the bullet rises because of the rifling in the grooves of the barrel
See the link below titled BULLET
No. Assuming the barrel is level (defined as perpendicular to the pull of gravity) then the bullet will leave the barrel horizontally and immediately begin to fall, like any other object subject to gravity. There are aerodynamic forces from air resistance, but these do not impart lift to the bullet. Often the gun recoils (per Newton's laws) in such a way as to raise the barrel after the bullet has fired.