my advise is that your dog will associate the gun with the bad bang and you need to build that back up without any noise. If possible without scaring neighbours bring the gun out when you feed the dog. Get the dog comfortable with that even lay the gun next to the dog while it’s eating. Then get to the point where you either break or work the action while the dog is eating. . Do this for as long as you need before introducing any other noise. You could even use a clapper at dinner time without the gun present getting used to the noise but not trigger the fear of a gun being there to disconnect the two for now.
Just my 2 cents and what has worked for me in the past.
Good luck
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