Brady's grading system and "sensible gun laws"
Howard Nemerov's analysis is here. Brady Campaign grades States A-F on how their gun laws match Brady's ideal. Nemerov's statistical work suggests that (1) high Brady grades correlate to low gun ownership -- restrictive laws reduce the number of persons who can own guns and (2) they also correlate to higher violent crime and homicide rates. The highest rough quartile (averaging B+) had a violent crime rate of 610 and a homicide rate of 7.6 . The lowest quartile, average grade D-, had a violent crime rate of 320 and a homcide rate of 4.2.
So Brady's "commonsense" gun laws are associated with inhibited gun ownership and higher violent crime and murder rates.