Not an expert but your range sounds about right. Probably closer to the 7 1/2- 8" overall length.

You figure the blade is 3" to 3 1/2" (Atlanta Cutlery is 3 1/4")

Handle is around 4" - 4 1/2"

If you were to make your own - check the width of your palm to make sure it is comfortable for you to grasp.