Lautenberg, McCarthy propose high-capacity magazine ban – New Jersey Sen. Frank Lautenberg and New York Rep. Carolyn McCarthy said Tuesday that they have introduced companion bills to ban high-capacity magazines holding more than 10 rounds of ammunition. The proposal from the two Democrats is part of a broad set of gun controls President Obama has vowed to push for in his second term, following the shooting deaths of 20 children and six adults at Sandy Hook Elementary School in Newtown, Conn., last month.