Help With Projectiles

I'm trying to make a projectile with no gravity that despawns after a few seconds, and it's proving to be much more complicated than I had thought it'd be. The main issue I'm having is that the "while projectile is flying" trigger seems to be completely useless, and "on loaded entity tick update" doesn't work for projectiles. All the other tutorials and threads I can find on this topic seem to be a few years out of date (I'm using 2024.1) so any help would be appreciated.