Korean dart projectiles were not boarding weapons

Were large dart or harpoon projectiles used to assist boarding?

Their use for boarding is not documented here; Korean forces used them while trying to prevent Japanese boarding actions.

Japanese crews had more experienced close-combat troops and could absorb greater personnel losses. Korean forces therefore used artillery and protective ship design to prevent boarding rather than facilitate it. The answer ties projectile employment to a larger tactical choice: preserve the fleet's gunnery advantage and deny the enemy its preferred fight.