What i use for pork is pork buts. they have the proper ration of fat to meat and most time around here i can get the butcher to even grind it for me and that saves a step in the process. Ive tried beef fat and didnt care for the final product using it. 10lbs of lean venison with 2 lbs of pork but added works great for summer sausage. For fresh sausage i like it 5050 pork/venison