It seems like the California Attorney General's office would have numbers on exactly that, though, as it records the identities of both shooters and people who hold CCW permits.
Is the claim you're making that 1.7 million CCW permit holders have shot another neighbor over a dispute?
The first result I got from your search query was this
https://www.latimes.com/local/lanow/la-me-tehama-county-shoo... (archive https://web.archive.org/web/20210718215711/https://www.latim...)
> Neal fired eight rounds into a Ford F-250 occupied by a mother and her son who were headed to school. The boy suffered non-life-threatening wounds, but the mother was seriously injured, Johnston said. The mother, who had a concealed carry permit, pulled out her own handgun but was unable to fire it before Neal drove away, Johnston said.