I've hunted Eastern and Rio Grande turkeys but not the Merriam, Osceola or Ocellated turkeys. Is one species of turkey harder to hunt than the other, whether it's calling, location of the hunt or time of year the hunt takes place?
I'd say the hardest to get would be the ocellated. They'll cost you a few thousand dollars and a plane ride to Guatemala which makes it pretty tough lol. As far as calling I've heard that merriams respond the best to the call out of all the subspecies although the eastern isn't too bad either if you can get on the birds. I would say the osceola and rio grande would be the two toughest from a calling perspective.
The tough thing about the Merriam's is the fact that they are more nomadic than the other subspecies. You will typically find easterns, rio grandes etc in the same creek bottoms year after year. Merriam's move around a whole lot more. Unless they are being fed which is a problem in a lot of places here. There is nothing more annoying than finding that the birds are holed up on some jerks land because he is feeding them. I have seen anti-hunters do this to keep "their" birds from being harvested and I have also seen guys to this so they can hunt them for themselves. It really gets on my nerves. I had to backpack in for turkeys last year because of this.
As a Taxidermist I look at hundreds of Whitetail Bucks every year. I know that I have seen many different ways people judge the size of racks on live deer. I think for the most part they all are pretty close. I'm going to give you some measurements that I have noticed being right on in just about every deer. We have used it in the last couple years and have only been off by about 5-6 inches. We do study the deer while bowhunting so we get a little more time to look at them....