Equinox 800 hunting in a lake question

When I'm in a lake I get quite a few signals and when I dig them there gone. Are these iron? I didn't look at the id and I haven't put it in all metal. I go around the target and it hits all around. I'll try all metal next time out.

Settings Park 2, 2 tone, tone break 0, recovery 4, iron mask f2 0, sensitivity 23.

Rick....... if you are in 2-Tone....... are the 'suspect' targets ID'ing as iron?

My guess is....... a .22 rimfire bullet will be detected at 2" deep. Then....... a 5" deep hole is dug......and the heavy (tiny) lead finds-a-way to fall back into the hole..... and detectability disappears! ((( I lose more targets IN the water.....than I do ...when I'm hunting the wet-slope. Small targets inevitably fall through my scoop holes....... and POOF....... they are gone! )))

I think the id is 1. Probaby tiny pieces of foil that float away.

I have a screen in my scoop to catch earrings so I do catch some foil. Foil floats away to easy.

Yes...... that could easily be a possibility.