I load lead and jacketed, and the only advantage that just jumps out is that lead is not authorized in polygonal barrels, and jacketed is. I know that lead can go supersonic. Properly lubed and sized, lead can do just fine. It's just not authorized in polygonal tubes. I leaded up a 1911 barrel in my younger days. It's a wonder I didn't walnut the barrel. I came to appreciate jacketed bullets in fullness. Now I shoot both. Just no lead in polygonal rifling. Not authorized.
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