Michael Bane thinks this might be the start of other shotgun rulings. It’s certainly possible, but the root problem is how to interpret the sporting purposes clause. Congress wrote a bad law, which is bound to lead to poor interpretations of it. ATF’s assertion, at it’s core, is that there would be hardly anything that wouldn’t be importable if IPSC and IDPA were considered to have a sporting purpose, and thus it would render meaningless something Congress clearly intended to have meaning.
There’s two thinks I think we need to advocate here. One is that the sporting purposes clause be eliminated. The second is that destructive devices are increased to any firearm firing fixed ammunition with a bore diameter of greater than one inch. This is hardly radical, since the UK allows shotguns up to two inches, and doesn’t have any overall restriction on bore size. At the very least, we should demand any shotgun be legal outright, not under exception.