Hi CyberWolf,
So I tried the blueprint you shown in the video and it works to a degree. It shoots up and down, and gets kinda wonky similar to the video. I tried removing the pitch from the rot when creating the transform for the spawn. It seemed to work well but not sure that will fix it for you. I didn’t experience all the problems I seen in your video, so I have another solution for you.
This will shoot directly in front of the pawn 100 units, whichever direction it is facing. The mouse will face the character the direction, so there is no need to have that also tell projectile where it needs to go. The projectile goes where the character is facing. This ensures the information it receives is accurate to that frame, and there is no delay-- which is something you’d get from a mouse.
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Let me know if this works for you!
Peace