He mentioned hard cast. That’s not considered expanding.
Hard cast can and does take many forms, but we're off on enough tangents.
It's considered lead alloy. As lead alloy, it is specifically legal.
Except in Dorchester County where #1 buckshot or larger may be used, firearms used for deer hunting may only shoot one all lead, lead alloy or copper soft nosed or expanding bullet or ball. Sabots are permitted. Non-expanding full metal jacketed, incendiary and tracer bullets are not permitted.