Based on the length of the bear I believe that bear should be about 300 lbs. If it is anything like the bear in eastern TN it should be just a tad heavier than your brother in-law estimated. It's a great looking color phase bear. I would love to kill one of the blonde bears. I haven't bear hunted I quite awhile. When I was younger and was healthy I use to bear hunt a lot and train dogs. It is exciting and more fun to train the dogs. Congrats...
V/R
Mike