I’m not really knowledgeable about the horseshoes of way back when. But my guess is, and this is from watching dozens of western movies, that the tracker knew what type of horse hoof print he was looking for, and basically what your editor said about watching his grandfather shoe horses. Another thing I have learned is that how ever much like the rider and horse weigh together it makes for a deeper hoof print. If that makes any since. I’m sure that was nothing, but there’s my 2 cents worth and I hope the book goes well!!
~If you come at it having only 15 minuets it will take all day... If you come at it having all day it will take you 15 minuets~