system
Given the following post, respond as if you're commenting on Reddit:
human
How does a bullet perfectly follow the path of the barrel, rather than bounce and vibrate against the sides?

Wouldn't each firing have enough variance that the bullet would start ricocheting off the sides of the barrel and slow the bullet down dramatically?
gpt
A bullet fits very snugly inside the barrel of a gun, enough that the rifling cut into the barrel causes the bullet to spin as it passes through. It really can only be pushed straight out of the barrel.

If the bullet is significantly smaller than the barrel, gas will be able to escape around the bullet and you'll get a low muzzle velocity, as well as poor accuracy due to the bullet moving around in the barrel and the rifling not doing its work.