The SKS has a 10 round magazine not a 20 round like the news reprted.He was using a scope on single fire.
It wasn't on the banned list.
Fire power not much different than a lever action Winchester 30.30.
I have hunted with a British Mk4 .303 with a 10 round magazine.
Nothing special about the weapon used here.
PS.The news makes it sound like he mowed 8 people down.He shot two right off the bat and stalked the other 6.
They did/do make 20 round fixed replacement magazines for it. Good chance the guy might have had one.