Congratulations on a great buck along with your horse, Charlie. Not many more fun ways to hunt big game than with a horse or mule. Those mule deer when they get that size are amazing animals.
Only have been around one full scale mule deer migration. Was outside of Pocatello,ID a couple hours ,into WY. We saw about 50-60 deer on the move in a migration corridor , in a short two hour period. All mule deer heading in the same direction down out of the mountains .Within hours we were in a full blown blizzard and our road back to Pocatello was closed by the storm. We ended up spending the night in a hotel until the next morning when the storm ended and the highway department reopened the road. Traveling for work in western WY, over the years I have seen some smaller mule deer migrations of deer all moving in the same direction in one of the well known migration corridors. Unfortunately there was also a pretty good number of road killed dead mule deer along this stretch of secondary highway.