Season venison liberally with Kosher salt and pepper. In a large Dutch oven or heavy-duty pot, cook bacon over medium heat until crispy. Reserve bacon and leave bacon grease in the Dutch oven. Add venison and brown evenly. Once browned, use a slotted spoon to remove venison from the pot and hold in a bowl or plate.
Add onion to the pot and cook until lightly browned, about 4 – 5 minutes. Return venison to the pot, add rosemary, garlic, red wine, stock and balsamic vinegar. Bring to a boil, then reduce heat to low, cover and simmer for 2 hours or until meat is tender.
Add remaining ingredients except sour cream, bring to a boil, then reduce heat and simmer until pumpkin is tender, about 15 minutes. Season to taste with additional salt and pepper.
Crumble reserved bacon. To serve, ladle into bowls and top with sour cream and bacon crumbles.