What you are describing could be a rifle that is not loaded, partially loaded or fully loaded, but, does not have a round chambered.
The breech is the rear of the barrel, where a cartridge would be loaded. The muzzle is the front end of the barrel. When fired, a bullet is driven up the barrel, and out of the muzzle.
The breech area on any gun is the area where the pellet / bullet / BB is loaded into the barrel. The bullet stays here until the trigger is pulled.
Marks, or striations on a bullet are made from the bullet running against the metal of the gun. The barrel of the gun determines whether the bullet curves to the left or right.
NO. The case is too large to enter a 22LR chamber. If chambered in a .22 magnum, you will be firing a .17 caliber bullet out of a .223 barrel, with no accuracy at all, and splitting the cartridge case.
bullet
The barrel guides and accelerates the bullet out of the rifle, and imparts spin to the bullet to stabilize the bullet in flight.
If it is chambered for it.
Do not attempt to use ammunition in a weapon not chambered for it.
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.
Any firearm chambered for .223 or 5.56mm