It depends on what do you want to use. You can do bullet with raycast or You can simply adding velocity to the bullet or you can move the bullet as projectile i

It depends on what do you want to use. You can do bullet with raycast or You can simply adding velocity to the bullet or you can move the bullet as projectile in vector 3 and calculate the trajectory of the bullet. You can generate random point inside circle to add error in your final position of the bullet