In a chilled bowl, add the pre-chilled venison, pork shoulder (pork butt), salt, dextrose and pink salt (instacure # 1). Mix well to combine.
Grind the above mixture through a large die plate into a pre-chilled large bowl or a bowl that is set over ice.
In a separate smaller bowl mix all of the seasonings and fermento or buttermilk powder. Stir in enough cold water to dissolve and to form a paste. This will usually be between a 1/4 cup to 1/2 cup of water.
In a stand mixer or meat lug add the ground venison and paste. Mix thoroughly using a paddle attachment or sturdy spoon for about 2 minutes. Add the diced bacon to the venison mixture and fold in until just combined.
Add the sausage mixture to a food-safe storage container or gallon freezer bag. Press the sausage down, ensuring that there are no air pockets. If using a storage container, add plastic wrap directly to the top of the meat, pressing down firmly. Then, cover the entire top of the container with more plastic wrap. If using a gallon freezer bag, remove all air and fold over any extra space in the bag.
Refrigerate for 2 days.
Grind the sausage for a second time, using the small die plate. If you want to check the flavor, now is a good time to fry up a piece. Add more seasoning if you think it needs any. But remember you will more than likely be eating this sausage cold or at room temperature and cold food needs a little more salt than hot food.
Stuff the sausage mixture into your casings to your desired lengths.
Hang them to let dry for 1 to 2 hours at room temperature or in the fridge. This will help get you maximum smoke flavor.
Cold smoke the sausages or smoke them at the lowest temperature you can for 2 hours (this step ensures a great smoky sausage). Now get your smoker set at as close to 180 degrees F as you can and hot smoke them until the internal temperature is 150 degrees F.
Pull the sausages from the smoker and let them hang at room temperature for 2 hours so that they bloom and turn that rich mahogany color that we all dream about. What you're left with is a delicious summer sausage that is ready to eat or refrigerate until needed.