Combine the flour and salt. Using 2 knives or a pastry blender, cut the butter and shortening into the flour until you have pea-sized pieces.
Add the water, 1 tbsp at a time until it comes together when pinched. Be careful not to overwork your dough. Form into 4 discs and wrap in saran wrap. Refrigerate for 1 hr if you have time (if not, it's fine).
To make one pie, roll out 2 discs of dough on a well-floured surface until slightly larger than your pie plate. Carefully roll one layer onto your rolling pin to easily transfer to the bottom of the pie plate.
Fill the pie with half the moose filling, then cover with a top layer of pastry and pinch the sides together to seal. Poke a few holes in the top to vent any steam.
Place in a preheated 425F oven for 15 minutes, then decrease the temperature to 350 and bake for an additional 30 minutes, or until pastry is browned and cooked through.