Three years ago I shot a 270 lb. Russian boar. I got 85 lbs of meat, all boned except for the rib cuts. The processor was paid by the delivered weight, so he had no motive to shortcut me. I was surprised during the skinning at the mass the animal lost as the skin and head were removed. This meat yield works out to 31%. My deer yield averages around 40-45%, depending on deer size, before the pork is added to the sausage. Some of these butchers charge by delivered weight, others a single processing fee with additional charges for sausage prep, so it goes against their profits to cheat. Having skinned and butchered deer in the past, I feel comfortable with these yields.