Any convar for ammo or damage?

You should look into the SWEP:SecondaryAttack function. I can't actually recall how exactly the AWP's scope is handled, but you could certainly insert some code after the zooming-related code finished.

Poopity scoop, I wanted to make something like this in a sourcemod but never figured out how. Since you seem like a Lua guru, I wanna ask you a question:
I wanted to make it on my version of the AWP so you need to be zoomed in all the way on your scope in order to do a one-shot. Problem: If I just tie it to the request to zoom in, you can basically quickscope to get full damage. Do you know how to tie a hook or etc. to when the zooming FOV change has finished? Thanks!

awsome

cool cool