savage1, you won't find any belted magnums for the handi except the 450 Marlin which has no where near the pressure of a 300 mag or 7 mag.
Bill3006, yes you can use the Federal high energy and Hornady light magnum loads in a handi. They use a special blend of powders to keep the pressures within SAAMI specs. Either one in a 30-06 would be hot on the heels of a 300 mag.