Safety rules
http://darkwing.uoregon.edu/~joe/firearms-safety.html
Positively identify your target and the threat it poses before firing
at it.
What's behind your target? Always make sure that a stray shot, or a
bullet which penetrates its intended target through and through, will
be safely stopped.
Never shoot at a hard surface, or at water -- your shot may glance off,
ricochet and injure someone.
Never shoot at glass bottles, living trees, or inappropriate targets
which would create a hazard for other persons or damage the environment.
Never shoot a rifle or handgun directly upwards, or at a high angle
of elevation. Even a rimfire .22 bullet fired at an angle into the air
can have enough energy a mile and a half away to accidentally kill someone!
Never shoot across a highway or other roadway.
Never vandalize a road sign (or other public or private property) by
using it as a target.
Never poach a game animal out of season, or shoot any game animal you
don't intend to eat.