</font><font color="blue" class="small">( You don't just swing it around in a circle; you have to pop it like a whip to break its neck. )</font>
I would bet this would work....except that in doing so you would have to allow that head to get pretty close to you, and any little misplacement or mis-swing could slap that sucker's head right up against one's own. I'm not averse to snakes, but I prefer them at the end of a collection stick. I remember as a kid trying to use a bull-whip, and punishing myself severely for my lack of coordination. That whip at me up.
</font><font color="blue" class="small">( I heard a long time ago that if you grab a snake by it's tail and sling it around in a big circle the force will make it's head pop. )</font> I imagine the Gs could become fairly intense, but if it does "pop", where is all that venom going? Any of that stuff in your eyes, nose, mouth, is a serious problem. And if it doesn't work, you will have one seriously whizzed off, albeit intensly dizzy, snake on your hands.
I used to collect snakes for milking and other purposes for a herpetology professor at UC...many decades ago. Mostly in what is now Shawnee FOrest in SE Ohio. We would typically get a dozen or so copperheads and several timber rattlers on a Saturday. Don't recall ever finding a water moccasin or the eastern massasauga.