Auto Fire Projectile

So i make an auto fire projectile based on the available fps fire but theres to problem that i encountered heres the picture:

1st problem

as you can see the projectile still seen by the character how to make it fast enough so it disappear but also not affect the damage type cause i already tried increasing the spped and it still seen by the player but the damage now can move big blocks so how to do this?

2nd problem
so yes the the projectile now can go auto but this is a weird part sometimes the audio loop when i fire but after about 10-15 shots of auto fire it stops looping and i must release the left mouse button for it to loop the audio again so why this is happened and how to solved this i gave you the pictures of blueprint: