For one thing, it's expensive. It also generally requires a different choke tube for optimum results. Most turkey hunters are already set up for lead. And, as long as you keep your shots to 40 yd. or less, there's really no advantage. Winchester's X-tended Range is an exception. It gives hevi-shot performance,but it's softer so you can use a regular, lead-only tube. It, however, is still very expensive.