INFO on race, weapon, sex is missing. That much noise, brings people at least to their windows to look. Unless they are all Hearing Impaired.
https://profootballtalk.nbcsports.com/2021/04/08/former-nfl-player-philip-adams-kills-five-then-himself/
I didn’t know the size of the property, but it was big enough for the doctor’s livestock. Most of the bodies were found inside the house. The nearest neighbors might not have heard any gunfire. If they did, they might not have thought anything about it. This is South Carolina. We shoot here. There’s a lot more target practice and shooting of wildlife than there is criminal use of firearms.