I found a cool little silver ring (among other things) today!
It had a very clear signal amongst the iron trash. The AT Pro gave off a solid tone with target ID at 80 or 88 at 8" using the small 5x8" coil.
I'll leave a pic! Thanks for looking!
Whites DFPI, 2 @ Excalibur II, 2 @ Sovereign GT w/ 10" & 8" Tornado coils, 2@ 10x12 SEF coils all on their own rods, Whites MXT Pro , 2@ Garrett Pro Pointers