Went out to an old fairground that dates back to the 1870s. Ended up with 3 keepers and a ton of Wheaties. No old silver and no Indians, but a good hunt. Definitely want to go back and try again. With an open screen, there were 8-10 targets per sweep, so it was very slow going. The mercury dime was about 8" down, the Rosie was about 5" down, and the Washington was about 8-9" down. I think the older stuff is deeper than the 6" would go. The Washington and Mercury dime were found with the stock coil. Right before I left I actually put the 17" coil on and found a couple of wheats 10-11" down. Surprisingly, the big coil would ring loud and true, even through the null, so I may leave it on next time and see if I can coax something deeper out of the ground. Thanks to sube for his advice on how to hunt this place.
http://www.youtube.com/watch?v=V2c4zsVBYA8
http://www.youtube.com/watch?v=V2c4zsVBYA8