SAN DIEGO—A federal appeals court upheld on Nov. 30 California’s ban on high-capacity ammunition magazines, which a San Diego federal judge previously overturned and ruled as unconstitutional. A divided Ninth U.S. Circuit Court of Appeals ruled—by a 7-4 margin—that California’s ban “on legal possession of large-capacity magazines reasonably supported California’s effort to reduce the devastating damage wrought by mass shootings.” The ban outlaws magazines that hold more than 10 rounds of ammunition. U.S. District Judge Roger T. Benitez in San Diego previously blocked the ban, ruling that the law violated the Second Amendment rights of gun owners and that its passage was an overreaction to high-profile gun crimes. Benitez issued his ruling in favor of several San Diego County gun owners who argued the ban burdened lawful gun owners and did little to reduce violence. Benitez’s decision was upheld by a three-judge 9th Circuit panel last summer, prompting the “en banc” review of the case by the full court at the request …