We don't do "permanent loss of your right to own firearms" without someone being committed or the like, or being convicted of any felony (a bit silly given how many things have been felonized now) or a domestic violence misdemeanor.
My home state of Missouri is like California in having both serious urban and rural areas, and per the law (http://www.moga.mo.gov/mostatutes/stathtml/57100000301.HTML) this sounds like a "Class D" felony, modulo case law I haven't checked that might not count the initial accident as "Discharges or shoots a firearm into a dwelling house...." vs. doing it deliberately at closer range.
But if it did, it would be about as serious as you desire, although I note "immediate arrest" for the first incident doesn't sound like it would necessarily be in the cards, given the potential difficulty of proving the crime. I.e. you can't allow the hammer to come down so precipitously for an action the complainant might himself have caused, i.e. make the hole in whatever fashion and then claim a particular neighbor did it at long range without your witnessing it.