Talk:120mm Twin Gun Mount/@comment-49.145.95.14-20150826142445/@comment-26460664-20150827140742

Also notice that this gun includes better accuracy; if a gun has a long barrel with a spiraling pattern, projectiles fired from the gun will leave the barrel at a higher speed with better accuracy. The spiral pattern is called rifling, it allow the projectiles to spin in the air while maintaining accuracy. Thus when all this facter is combined togather:

~long barrel (more range)

~rifling (more accuracy and penetration)

~smokeless powder (fire projectile with more energy)

~type/shape of projectile (better damage output/weapon effectiveness)

You will get better damage, range & accuracy. I'm not an expert in naval weaponary, but you might want to look into history of guns if you're interested expecially muskets cuz they are the earliest firearm in gun history.