I am not sure how they are regulated, but the person that I spoke to, said that they are regulate dat the factory for Federal Truball ammunition. Is this a hit and miss type regulation trying all the slugs made until one brand hits on target at 75 yards, or are they actually regulated? It comes with a regulation target. The person also says that he tried another brand (Brenke?) and stated that they just hit low.
As for the CZ coachgun, I would like to find one myself in 12ga for the same reason.