Been impressed with the depth and TID accuracy I get with my 705 using the 10.5 MF DD coil. Detects my test garden dime at 9" with a fairly accurate TID and the 7" dime comes in consistent tone and TID. What kind of depth and TID accuracy do you think I would experience putting on a 6" HF DD sniper coil? As a reference, my 10x5 HF DD coil will not detect the 9" dime and the 7" dime reads a -8 but is detectable with tone and TID. Southeast Pa. soil.