The initial reports were that he used an "automatic assault rifle." This later got changed to a "semi-automatic assault rifle," then an "SKS assault rifle."
What reporters know about any rifle wouldn't fill an empty shell casing.
I've been told that people hunt will with an SKS, but I've never actually come across it.
I agree it remarkable he was able to shoot 5 (presumably) armed people without taking return fire (that we know of).
Remarkable, but not unheard of. If he was in a good well concealed stand, and a good shot, the poor guys didn't have a chance.
And tomorrow to be changed again to "30-30".