Not sure the percent fat. The meat was a butt roast purchased from grocery store. The grind came out with a lot of white in it.
Used 1/8 cup water for one pound of grind
Put meat and water in kitchen aid mixer with paddle blade. Mixed in seasoning on low speed and then turned speed up to maybe 30% and mixed until meat started to get sticky. At that point used norpro mini burger press to make patties. Then froze.
Thawed patties in microwave 2 min at 50% power then cooked in non stick pan on electric burner maybe medium heat.
Shrinkage estimate maybe 20% in diameter and 10% in thickness. We do the same cooking process with rb rice sausage and get almost no shrinkage.