Combine elk and seasoning in a large bowl. Using a cheese grater, incorporate butter. Form mixture into four patties. Chill patties for 1 hour in the fridge.
Cook 6 slices of bacon. Set aside.
Prepare the heat source of your choice. Grill for 2 minutes on the first side and then flip. Patty should easily release from the grate or pan. Add cheese to cooked side and cook for another 2 minutes.
Spread mayo on one side of brioche buns. Add greens and then burgers. Top with bacon and blueberry sauce.