F75SE observation (maybe)

It might be my imagination, but it seems my f75se has less jumpy ID numbers on targets that are higher quality alloys as opposed to junk items that read similar in value. I've been relic hunting with it mostly but did get in a yard today and struck a somewhat deep penny. The bullets (approximately 210 years old) I've been digging have a more bouncy vdi even at moderate depths, the penny was strong and a whole lot more stable.

Yes.... signal strength and target 'jaggedness' play a large role in ID repeatability.