The musket was not a very popular and useful weapon, being inferior to the bow. It now shoots 5 weaker bullets in one shot with less damage per bullet, this might require some further testing and fine-tuning. Also the weaker bullets mean that they can be used in a gatling-gun (WIP) and in the airplane as well.
This better reflects what the function does. "ProjectileHit" was never used solely for projectiles. Neither was everything of that callback ever needed in all places, which resulted in weird flag-parameter hacking and OnStrike-callbacks. Splitting this up also allows customizing different parts of the behavior further (i.e. tumbling) without adding a hundred parameters or flags to the original function.