+1 what Big Boys said. Pretty much what is suggested is the first 100 hours you use a new machine, is dig everything. Pay attention to numbers vs what comes out of the ground. 30-35 is pretty much iron in the form of rusted hinges, hardware or nails probably from the old barn in your picture and all the carts, buggies and farm equipment likely stored near it over the last 100+ years. So, Just dig a lot of everything until you know the machine. Check out the AT-Max group I started. I've got a little info there from my 5-10 trips out this year with it. Mines hung up for the season since its hunting season and winter is fast approaching. Good luck and post what ya find.