My own preference is for beef fat. 5 to 1 will give you a 20% fat content 5 1/2 to one will give you an 18% fat content, the 18% mixture seems about right for most of my uses.
If I make sausage I'll use pork fat and run about 25% fat content depending on what I'm making.
Hope this is of help to you. Beats the hell out of tag soup.
Z
