Who ever came up with the "legitimate" sporting purpose law has not regard for the 2a.
Who decides what a sport is? I hear basket ball players say running & swimming are not sports all the time; yet weight lifting is? All of this is seriously opinionated (firearm sports included).
In my opinion anything can be a legitimate sport: as long as it has some aspect of competition, skill, or endurance and of course people who enjoy it.
I mean how the hell did the .950 JDJ get approved for a "sporting purpose" by the ATF. shooting that thing one time has the potential to break your shoulder & collar bone! Plus at $40 a pop it's not like anyone will do any serious target practice with it! In my eyes the only things it's good for is killing whales, elephants, & destroying stuff (shooter included).
The striker shotgun does have legit sporting, hunting (with ammo cap restrictions), and self defense. Yet it is banned... why? I mean you can get a saiga 12 with a 20 round mag which is far more effective than a striker for dastardly purposes... yet is legal & very common.
What this country needs is to heavily scale down the bureaucracy and mindless red tape the government has imposed on this "once free" country. We have evolved into a protectionist police state that wipes it's A**hole with the constitution and bill of rights that so many people gave their lives to defend.