A young man was shot in the elbow as a result.
Mr Hore, a 36-year-old from Pateroa, will face the charge in his first appearance at Alexandra District Court in Otago on Tuesday.
"Police were called to an incident where a man and two firearms have fallen off an ATV vehicle and as that happened, as the shotgun hit the ground, it discharged and shot a man in the elbow," the spokesman said.
"As part of that police did investigations and a number of people were charged."
The spokesman said he could not make any further comment.
A court spokesperson confirmed Mr Hore would appear in Alexandra next week.
Mr Hore is hailed as one of the 100 greatest All Blacks of all time.
He kicked off his career in the All Blacks against England in 2002 and played his last test more than a decade later against Ireland in 2013.