Hi springmom,
If they're 'hardcast' they can't be pure lead, they will have to be an alloy. And the idea is to make them foul less because they are harder. They usually aren't as clean as jacketed bullets and the amount of fouling will depend on the gun, the bullet alloy and the load you use.
The reason I said "usually won't be as clean" is I have had lead bullets that were made with such a hard alloy you couldn't scrape them with a knife blade and they didn't fould the barrel at all.
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