Ricochets are completely unpredictable. Even with a perfectly formed backstop it's still possible to get an occasional ricochet, but 'shooting at a hill' would not be a well formed backstop. Not even close.

It's the shooter's responsibility to control his projectile, and his liability if damage results due to lack of control. That's irrefutable.

If it were me I would have a very frank conversation with the neighbor....to the tune of 'my children are more important to me than anything at all, and having a ricochet going over their heads is completely unacceptable. What do you intend to do to resolve this?'

If that conversation doesn't provide any resolution, then the next step would be to file a formal complaint with the sheriff's dept.

Dale

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"When tempted to fight fire with fire, remember that the Fire Department usually uses water." - anonymous