Just warn them ahead of time :)
The .22 I had as a young teen was an 18 round semi auto. One new neighbor freaked out the first time she heard it and called the cops saing someone was shooting a machine gun. Cops came, laughed and told her I was OK. She was a witch, and called the cops on me a lot, until the chief paid her a visit and told her to stop.
I wonder why her house got the worst of it for halloween. Hmmmm.