We have a 6 foot fence around our turkey areas and the hens can clear that with ease, the toms are to big. It's rare we have any go over, but then again they have spent their whole lives there so that is home to them. One day I didn't latch the gate to our Beltsville pen and when I can home from work the whole flock of about 25 turkeys were milling around the front yard. I just shoo'd them back and they all went right in.
All the heritage breeds will sit and raise poults but the hens are like chicken hens some are good mothers some not. Also, the best mothers come from poults hatched by a hen. Most people incubate eggs so the mother instint isn't as strong.
The best tasting turkey we have is the Midget White followed by the Bourbon Red
Size wise Standard Bronze and White Holland are the largest, Mid sized - Bourbon's, Spanish, Slates -most of the breeds fall into the mid sized area. smallest- Midget White, Beltsville Small White. The ALBC and Feathersite list weights and have pics, we have pics of the birds we raise on our website.
Steve in NC