> What are bullets and shell casings made out of again?

Usually non-ferrous metals like brass, lead, and copper unless you live closer to Russia, then you may end up with steel-case.

That's besides the point though, the barrel of the gun will be steel.

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15155 2 days ago | parent [-]

Ferrous metals aren't required for any modern security-screening metal detectors: these materials are still highly electrically conductive, and therefore easily-detectable eddy currents are still inducible.

	▲	esseph 2 days ago \| parent [-]
		Oh, that's right! I remember reading somewhere about this a few years back. Might have even been here on HN. For some reason I hear "metal detector" and my brain goes right to magnetism.