im always plinking in garden with air rifle & find it helps to sort of make guns "the norm" they soon just get used to it and I then start getting the missus to throw a dummy out when I take a shot and giving the pup a chance at retrieving[its like a reward] ,the dog then thinks guns are good! I wont take it out to shotgun till 6+ months and will stand a field away whilst mate is shooting and its the pups reactions to the shots that will determine my next steps -but I wont push on until I know the pup is confident enough -billy