Midget Whites and Beltsville Small Whites are the smallest. Toms 18 to 20 pounds hens 10 -ish. There are rumors around the "turkey world" of people breeding them smaller. they are shooting for a 10 to 12 pound tom and a 5 to 6 pound hen. In my opinion it will be very hard to do and a long breeding program to get there. It's not easy to breed a bird down and reduce it's size as you have to breed the runts and the unthrifty birds to get to your goal. That alone tends to cause problems.