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Copper plated. Those are not uncommon today. Maybe cutting edge in 1970.
The idea is to get better patterns. As pellets move through the barrel many of the soft lead pellets will be deformed. After they leave the muzzle those not round will fly in an erratic pattern. Plating the pellets with copper makes them harder and less likely to deform giving tighter patterns. That is pretty standard for shells designed for turkey hunting
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