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Getting between the trash as mentioned in the above post is the most common application for small coils. There are times (bad ground) when you can crank up the gain and sense to get some good depth. Smaller coils see less of the ground matrix. Testing in a mature test garden with the DFX I got a solid, repeatable signal on my silver dime at the six inch depth. I also have picked out coins near iron with the 5.3 coil. I run tone ID and the VDI will vary on deeper items. A good coil for the 6.59 whites(like the XLT) is the Sierra Eliminator six inch. Not only have I dug seated and Barber dimes at a measured 6" I can work near 60 cycle power lines, near metal fences and other tricky places. I haven't posted here in years so I may not be a familiar poster to those who have joined the forum since 2006. In fact I had to reregister. Forum has a new look, very nice.
There are some great graphs and explanations in Jeff Foster's book "Digging Deeper with the DFX". He compares a number of White's coils and for me the greatest lesson was regarding sweep speed vs. depth. HH. Matt.