In a large bowl, combine tortilla chips with next 8 ingredients and mix well. Add venison, beef, chorizo and cooled onion mixture. Mix all ingredients thoroughly with your hands.
In a lightly oiled loaf pan or baking dish, form into a loaf about 4 inched tall. Bake in a preheated 375 degree oven for 50 minutes or until internal temperature is 155 degrees. Lightly cover with foil and allow to rest for 10 minutes before serving.
Whisk together sour cream, ketchup and lime juice. To serve, either slice meatloaf and arrange on plates and top with a dollop of sour cream mixture OR serve on grilled sourdough bread as pictured.