I started mine off with the starting pistol and used the short blanks as they don't have as loud a crack as the long blanks
Also I got my lad to fire it when the dog was about forty feet away then I threw a dummy that's was to act as a distraction
then gradually cut down the distance to shot when i knew he was sound then used the long blanks he is sound to shot no problems this is my first gundog if have trained so I am no expert still learning probably a bit cautious but did not want to mess it up .