The set event position command that teleports the projectile event back to its starting position is after the move route and I checked something that has the event wait before the move route finishes before it goes to the next event command. And yeah, you are right, it takes like 14 steps or so (default screen size would take 8 steps to reach the edge) so that it gives the illusion that it travels the whole way. I only implemented actual map boundaries in End of Winter. :D
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Thanks again for the direct help, and your detailed forum post.
I employed a (much simpler) projectile mechanic in my new game based on your method and linked to your games in the latest Changelog, so hopefully it will at some point lead a player to your creations!
I started on End of Winter yesterday too and will keep going as I have time, the bow mechanic is supercool.