We used a standard 0.0012" per inch of shaft diameter for all shrink fit couplings in the motor shops that I grew up in. I don't know where this number came from, but it was what the boss required in my first shop and it always seemed to work. We always installed the couplings by measuring the bore as we heated the coupling to insure there was adequate clearance to slide the coupling on the shaft by hand and not by hammer. We did use a little never sieze and as I remember we heated the couplings to around 300 degrees F to get the clearance we wanted to allow the coupling to slide on. I did it that way for about 30 years and never had a problem.
Since you're telling stories, I once watched a couple of mechanics install a coupling on a 1500 HP motor by running into it with the back of a fork truck.