I know this reply is too late for your recent trip, but something to keep in mind for the future. I do a western hunt each year. Once I punch my tag, I debone all the meat and freeze it solid. When I fly home, I use my backpack as my overhead storage bag. I line it with one of those grocery store freezer bags and place 45-50 lbs of meat in there. If I can't fit it all, I can put 10-15 lbs more in a carry on under the seat.
I dread the thought of putting it in my checked bags, with the very real possibility of them getting lost. I can only imagine the fetid stench after a few days, not to mention the loss of all that precious meat.
Hope you had a good hunt and were successful.