Police in South Zanesville called off their investigation Thursday since no charges could be filed, although the firing range owner concedes he needs better screening.
The Columbus Dispatch said two homes had windows shattered Sept. 30, with one slug found on a carpet and the other hitting a sill and bouncing off the ceiling.
Stray bullets from Briar Rabbit Shooting Sports, which sits atop a hill a half mile south, may have pierced two other homes in the area previously.
Investigators used the Global Positioning System and found the trajectories of the bullets were "consistent" with coming from Briar Rabbit.
Ironically, the caliber of the bullets matches that used by the Whitehall Police Department SWAT team, who were firing their .40-caliber Sig Sauer semiautomatic handguns that day while training at the range.