If you go to Porter's Heritage Turkeys, he has the genetic information on a number of breeds. There are some other sites as well, but his is the easiest to read. if you have a basic understanding of genetics, you can tell what happens when you mix two birds of known genetic makeup. Sometimes...
The poult is a bourbon red, so both parents had to contribute a red gene. I assume the hen was bourbon red?
Bourbon red tom X bronze hen will give all red bronze poults, which look like bronzes but are somewhat more yellow. I don't see any of these in the photo.
The dark poults I see do not...