I have to say as a gunner who regularly uses 105mm howitzers (well, to be honest, I haven't fired one or commanded one since '95 - I've had other duties in the unit since) I'm calling BS on the owner's "safety" measures.
When wingers are fired by professionals there is an investigation to find out where the screw-up occurred - here in the Great White North the drill is to get the crew manning the piece to step back from the postions in action while the TSM or the BSM check the lay of the piece, check the ammunition (counting charge bags to see how much powder was used) and comparing the data on the sights to what the Command Post ordered. We also have some fairly serious safety rules about ricochet, etc that I'm fairly certain from the news article aren't being followed.
Personally, I can see a number of outcomes here:
a. The insurer for the range is going to do a huge re-evaluation of the insurance coverage of the range in light of this accident and the inevitable lawsuit and settlement;
b. The owner of this piece is going to find it prohibitive to shoot due to the now exhorbitant costs of using the range, leading to the owner selling it or deactivating it;
c. Any calls to prohibit the civilian ownership of crew served artillery by civilians will be met with some activists screaming that this is the thin edge of the wedge and "da gummint's cummin' fer our guns!"
Will this mean that if artillery owners no longer use them on insured ranges (due to the prohibitive cost) and might instead just use them, uninsured, in the countryside at large ?