A tried a test out on my drive today with my T2 fitted with the SEF 12x10 coil. Settings 79 sens 52 Discrim and 2+ placed a rusty roman nail of fair size down. No grunt then placed a 3rd Century Roman coin of small module just 3 inches away. No iron grunt but the coin was found. Then placed a KGV halfpenny under the nail which by the way was hand made and 2.5 inches long with a large head. No iron grunt but the coin was found at good in air depth. Have not tried this out in the field yet too cold.Ground too hard