Are more gun law associated with a lower homicide rate?
At the Vokolh Conspiracy, Eugene Volokh demonstrates that States' Brady Campaign grades have no association with their homicide rates, or with rates for homicide plus accidental gun deaths.
Denton Bramwell recently updated his 2006 study of the same issue, and got the same results as nine years ago: no correlation. Brady "As," "Fs," etc. can have high or low rates, with no pattern discernible.
Now, it's (quite) possible that Brady ratings do not correlate with strictness of gun control. The items evaluated are chosen on a political basis ("do we want this now"?). But at the least these results suggest that policymakers would be foolish to base enactments on Brady proposals.