So my projectile, no matter what I do, always goes through walls, I tried to use the “on hit > destroy actor” idea (https://answers.unrealengine.com/sto...ecollision.png) but it didn’t work either, while playing, it keeps adding actors when I fire and never destroying them, any ideas?
If the projectile is too fast, it may don’t see the wall :
1000 m/s → ~40m per tick so the wall is too small to be calculated
use linetrace for collision, this will detect your wall 
(I know this question is old, but I’m gonna answer it anyway…)
Have you tried enabling “continuous collision detection” on the projectile?
Continuous collision detection prevents small and/or fast objects from passing through walls.
(To enable it: navigate to the projectile’s “details” tab, and under collision: check “Use CCD”.)
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CCD does not work for me when I tried it.
This one worked for me for the small bullet shells. Thanks