For deer sausage, I used to mix 70/30 with pork, or even 75/25. However, I didn't get a deer this year, either. :-(
But a friend from work gave me the hind legs of a buck he shot. He said it was an old buck, and I ended up with 12 lbs of ground meat, so I mlxed it 60/40 with pork. .. and...