What Rob is talking about is since the blades open from the front, to the rear, the blades need to enter the animal before they open. Since the blades aren't deployed as they enter, as they are with the Snyper, the entrance hole is smaller. BUT.....it's moot point, IMO. They only need to enter the animal 1" before they are fully deployed, so by the time the blades get to the lungs and heart of the deer, you're at maximum cutting diameter.

The ones I don't like are such as the old Punchcutters. The tip of the head had to be depressed, which is what opens the blades. JUNK! If that tip gets clogged, or whatever, before the blades open, or for some reason the tip returns to it's before shot position while still in the deer, the blades will retract back inside the head. At that point, you may as well be shooting a field point at them.

My only concern is if one doesn't have an exit hole, the smaller entrance hole may prevent a good blood trail. Theoretically.

Rob, mon ami, you bring about another good point. I was thinking about this topic today, and I thought of this....tell me what you think.

Ok, let's take a rocket hammerhead, just to use in this scenario. The blades fold up along the ferrule, and sweep back when deployed. Arrow is launched, tip strikes deer in the ribs. Point of the head enters deer and the tip of the blades enter next. At this moment, we have an entry hole the size of the tip, right? Ok....but the blades sweep BACK, toward the entry hole, right? When fully deployed, they actually extend behind the BH, thus making the entry hole the size of the blades.....Make sense, or am I all washed up here??