Hello!Is there any mod,script or console command that let you waste ammunition without reloading?

You can do it to guns individually by editing the .ini files for them. You have to change the magazine size to -1.

I think Aco Delta has a thing called thermatic weapons, they have a simple lua script that makes them regenerate ammo after not using it for a while [it's an alternative].

Or you could play with the shotgun reload script so it works like reloading with clips [not whole mags], or shell by shell.