I thought I had a good idea of how deep it would hunt, in a given circumstance. But today I got a pleasant surprise while hunting in a nearby park. This park is NASTY with modern trash. Every sweep of the coil would produce from 4 - 6 beeps! Foil, bottle caps, pulltabs, can slaw, nails, screw caps. You name it! Using anything less than a small coil would create too much masking, so I grabbed the 6-inch DD at 18.75 kHz. I am a big advocate of hunting in all metal and simply listening for the tones. But the trash was so bad at this site that I actually used a modified Pattern. When I would get a higher tone, I would switch to all metal and make sure that I was not getting the high tone from the "back side" of a ferrous target. Once I confirmed the audio was from the intended target, verified the TID, and sized them up via the Prospecting mode, I carefully recovered the targets. I have not been a fan of the higher freq coils for coinshooting. And the DD coils have not my first choice either. But this little 6-inch DD is unbelievable. I dug some of the deepest small cents that I have dug with a smaller than stock coil. Many of them were deeper than 6 inches, with the deepest being a 1919 D at a measured 8-inches. I have always been, shall we say suspicious of reports of finding coins this deep with a small coil. I always suspected that the coin was at the side of the hole and fell into the bottom as the hole was enlarged. But I was careful to make note of where the coin was located and it was definitely buried 8-inches from the surface. These new 6-inch coils are HOT! HH Randy