For blueprint you would do this inside your “Pawn” blueprint. You would grab the “Camera” component and use it as a variable in the blueprint. You would then use this components “Forward” vector to draw a line trace in that direction and you decide the length of this line trace. You use the return value from the line trace node to get information about the hit, if there is any. You then use the “Weapon Offset” in the blueprint to calculated the new velocity vector for the projectile.
I’ll be able to help more this evening if you need it. I apologize for the delay in my response… let me know if you need more guidance =)