The full trajectory path of a guided weapon can be much further than the weapon's range. A guided weapon's total path distance for setting waypoints is restricted to its range, but the projectile will continue to travel beyond that path until it is interrupted or hits the "boundary" which is a circle centered on Cogmind with a radius equal to the weapon range. This creates some interesting possibilities for firing guided weapons a long distance around corners, walls, or other obstacles.
To recreate: Fire a guided weapon and set the waypoint one tile short of its max range, then for the second direction select the tile one space back in the opposite direction. The projectile will reach it's "max range", turn around, travel it's "range" again as it passes Cogmind, and continue past until it reaches its "max range" in the opposite direction -- which results with a total projectile travel distance of approximately three-times the weapon's range.
This may be intended behavior (or even a bug-turned-feature
), but it is unexpected and not very intuitive so I've decided to submit it.