Ok there you go >
The arrow is of the start of the projectile, the longer i hold my mouse, the more value my projectile speed variable will get, after releasing my mouse, the speed will multiplied with the projectile velocity :
https://forums.unrealengine.com/filedata/fetch?filedataid=156311&type=thumb
The projectile itself has nothing but a rotation on it, so it looks its flying in a curve.
But since the way i have it done right now, makes it pretty hard to hit something. So i would like to make it simple and make the projectile just hit the mouseposition with a curve ( with a maximum reachable range ) that changes depending on how far away to location is.
Or if i would still use the charging option, i need some kind of trace, more or less like you did so the player knows how the projectile will fly toward the aim position.
Sorry for all the trouble 