A federal judge ruled on Tuesday that New York’s strict new gun laws, including an expanded ban on assault weapons, were constitutional, but struck down a provision forbidding gun owners to load more than seven rounds into a magazine. The ruling offered a victory to gun control advocates at the end of a year in which efforts to pass new legislation on the federal level suffered a high-profile defeat in Congress, although some new restrictions were approved in state capitals. The judge, William M. Skretny of Federal District Court in Buffalo, said expanded bans on assault weapons and high-capacity magazines...