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it seems to be quicker between the iron signals and the good signals,
I have found a good signal with all metal mode then I step to the side just to see if I get the iron buzz if I do I don't dig it.
my brother has the 300i and he swears by the jewellery mode he has had some good finds.
it all comes down to works for you.
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Use the 400i, which is very similar. Custom mode, iron audio off, 4 bars off ferrous metal section. Happy I am not missing anything. This setting has found a Silver Denarius, Copper & Bronze, Lead.
Garrett 400 I