We were semi-sure at about 3 weeks..and positive at 6 weeks. These were our first Bronze babies. Boys run a little heavier and have slightly bigger snoods and supposedly thicker legs..but at the time, we didn't know about the leg thing and based our determination on the snood and slightly larger body frame. Good luck with trying to decide, I read lots and lots of posts where people go a pretty long time thinking they have a SHE and it's a HE.
Just for fun we made this video of the perils of mentioning the holidays in front of our turkeys... They are Ridley Bronze turkeys and a lot of fun to hang out with! Except when they are trying to kill you, of course...