Making custom guns and their projectiles

Hey guys,

Trying to make a custom gun here and I had a few questions.

1: Is there no way to change how far a projectil might be registered, or to remove the bullet drop from them? It seems to behave like an arrow shot from a bow no matter what happens, which brings on to question 2...

2: Is there no way to remove, change or customise the sound the projectile makes? Discovered in testing that no matter what, it makes the minecraft arrow Twany/Twing sound when the projectile connects. I've tried adding sounds via events when it hits blocks/players etc to see if this will remove it but it does now, I just end up hearing both the sound I chose in the event and the arrow twingy noise. Anyway to stop this?

Thanks guys in advance!