Whyz that? In a sniper/hunting situation, you can probably assume that you will only get one shot to make your kill. In this case the semi-auto isn't going to offer any distinct advantage. If you're going for "two in the chest, one in the head" you'll be doing that a closer range and you'll want a semi-auto assault rifle, not a sniper rifle. For the end use we're talking about here, the bolt action is more than enough.