Since I started using Minelab machines on Memorial Day 2015, I have found 505 silver coins with them. 4 out of 5 of those silver coins have been found with the 17” coil on the CTX. Every single one of these coins was found on public land. Many of these coins were found after I had hunted some of these places before with machines other than the CTX. You do the math.
COULD these coins have been found with any other coil or machine? I will never know for absolutely sure, but I could assume some of them could. All I look at is the RESULTS. I wholeheartedly believe the 17” coil allows for an initial hit that draws your attention enough to investigate it. When the vast majority of these coins are 8-10” deep, any advantage counts. Just make sure your sweep speed isn’t too slow, especially if in Combined. Too slow and it’ll never even trigger the audio on a deep coin, or it will just “thunk”. It seems 50 tone is less prone to this...
As always, just my opinion....