The late Don Eagan's mold catalog, at the link.
Don Eagan's Catalog
If you are not familiar with Eagan's molds, they were popular with CBA benchrest competitors.
IMHO there is nothing special about the bullet designs other than being nose pour.
But they were designed to be a glove fit in a particular throat. And they were often used with tapered sizing dies to ensure a perfect fit despite as-cast tolerances.
His prices were pretty cheap relative to the quality. All I can figure is that he was retired and was doing it mostly as a hobby.