The PA Game Commission has approved hunting with semi-automatic rifles:
For deer and bear, full-metal jacket rounds are not permitted and semi-automatics used for big game are limited to a five-round magazine capacity. The measure also carries a sunset provision that expires on June 30, 2020 to allow for a board review the measure.
Limited five rounds in the magazine or five round magazines? Though, I’m guessing a blocked 10 or 20 round mag would work if not.