Help identifying items hitting on "coin" mode

[pa-dirt_nc-sand]

One is definitely a bullet casing, not sure on the others. Found at old stone foundation in the PA woods. No coins unfortunately, lots of very old trash found in coin mode with Ace 250

 

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[luvsdux]

These sorts of targets are a good example of why learning the subtle differences in the tones your detector gives is helpful. They all can and do respond as possible keepers similar to coins when bouncing on the tid screen display. Remember your relying on a MACHINE'S BEST GUESS, NOT A CERTAINTY.
luvsdux