I don't think I would recommend starting out turkey hunting with a 410, but if it's legal and one has a lot of experience in turkey hunting and a cool head. I see no problem with using one..if you are capable of taking the right shots.
I had thought in the past ofgetting one and reloading using Hevi Shot...but built a flintlock to use instead. Personally I think it would be easier to kill a gobbler with a .410 than a bow and arrow.