A a very interesting article from the American Hunter Magazine comparing different slug designs including various sabot slugs.

In the days of my youth, we transformed rabbit guns into deer guns by simply changing the fodder; you bought slugs from a hardware store bin at a dime apiece with no regard to brand or type. Today we actually compare ballistic coefficients in shotgun loads and perform the once unfathomable act of slipping off the safety when a buck appears two football fields away. [From Slug Comparison]