When I had one, it was while doing a field test and comparing signals with an XP Deus at the time. I remember at an old construction site, I got a 'soft' hit in discrimination mode, checked the signal in the no-motion all-metal and it still had that modulated sound with a tight pinpoint area. I did not thumb the disc. like some people do, had it set on MIN disc. Had my buddy check out the signal with his XP and he said it was a deep good one. The target ended up being an 8" deep memorial penny from the 60's. I was judging by the audio the Outlaw gave that it would go several inches deeper at this particular spot. I'm giving you an honest estimation on depth in my soil, your mileage may very.
PS: I forgot to show settings and coil.......
8" coil,...... Sens.10..........Disc. MIN,,,,,Ground Bal..spot on ,neutral....Threshold...just audible