Well on Minelabs website theres a link to there forum with some nice test videos on the 305.Check them out they might help a bit. Good luck cant wait to get mine.
I also recieved my 305 yesterday. Once the detector is turned on a constant hum was present and i can't get it to stop. Is this suppose to happen? I called Minelab yesterday and wanted to speak to someone in Tech support and was told they would call me back. I have yet to recieve a call back.
Well threshold volume is good at default make sure machine is ground balanced well- sensitivty as high as possible without machine acting squirley and tones on the 305 seems like quarters and dimes seem very high tone very quiet and nickels a little deeper and pennys deeper too. So far only hunted in mode 1 but dont think its a good mode for jewlry only coins.