With a quick change of the shotgun to any other weapon and back and timely pressing of the firing button, the rate of fire of the shotgun increases significantly. To use it, you need to assign a shotgun to 9 and any other weapon to 8. It is also most convenient to use this macro when the key is pressed.
Download the program (Download) and go to the macro editor
press the button «Open file»
and select the downloaded file
assign a macro to a key and run the program