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“ShootistX”How do you figure a longer barrel will give better accuracy?


its a fact if you had a long shot would you use a pistol or a rife where the main difference is barrel length
From an article  i read

The short answer: Yes, a longer gun barrel improves accuracy. Theoretical accuracy of handguns and rifles is driven by rifling, barrel length, and bullet mass.

    Rifling: When the bullet travels through the barrel, the rifling (helical grooves in the barrel) forces the bullet to spin by converting some of its forward kinetic energy to angular momentum. This gives the bullet gyroscopic stability. Remember, a gun without rifling is a musket – without spin, the bullet trajectory is unstable, like a ‘knuckle ball’.

    Barrel length: A longer barrel extends the time time interval where chamber pressure acts on the bullet’s mass. Therefore, a longer barrel increases the exit velocity of the bullet and the effective range of the bullet. Friction limits the allowable barrel length.

    Bullet mass: Increased bullet mass increases the bullets inertia (resistance to external forces). Therefore, the bullets trajectory is less effected by external forces such as cross-winds or contact with obstacles