science

Unless you're hunting waterfowl, it's all most all lead. It's often jacketed, but it's still lead. Lead is cheaper, rides the rifling more effectively since it's soft, expands better on impact, and is heavier.

For performance AND price it's just better. But you have to be mindful of its environmental and health impacts.

I used to reload a lot of my shotgun ammo with reclaimed lead from the range. Every few years they'd scrape the soil in the trap and skeet area and you could buy bags of the shot. It would be a mix of like 7.5, 8, and 9 all mixed together, but it worked for skeet shooting.