No. See comment below.
You do realize that a large number of guns used for hunting and virtually all handguns are semi-automatic, right? See my next comment.
A semi-automatic weapon is simply a weapon that fires ONE bullet with one pull of the trigger and does not require you to manually re-chamber each bullet. You still have to pull the trigger once for each bullet that leaves the gun, as opposed to an automatic weapon which can fire multiple bullets per trigger pull. Automatic weapons are highly controlled and something the average citizen cannot generally access. The vast majority of guns in the US are semi-automatic, including a large number of hunting and sport rifles and the majority of handguns/pistols. The term "assault weapon" has traditionally meant a weapon capable of rapid fire, as in the gun will continually spray bullets as long as your finger is on the trigger. That would be an automatic weapon, which again, is not something US citizens are generally going to have and not what was used in the shooting.