Rick, my goto bear call is an older version of the Sceery Coarse Predator like shown in the image below. Having the reed cut the way it is allows for a lot of flexibility and variety of sounds. I would highly encourage that type of reed rather than a more traditional seperate slender reeds which are more helpful for producing howls or high pitched multiple animal distress calls.
Just a suggestion, it is a double barrel call and as such is fairly large. I had to grind down the mouth piece as thin as possible because it would cause my jaw to get fatigued after calling for a while. Just something to be aware of since I can't judge the size of your prototype.
