Works like a hole saw? Really? What would the revolutions per minute have to be for something to "hole saw" at the 1500 fps or so a 9mm at that weight is likely to see? 9mm is what, about a 1 in 10 twist rate? What rpm would that impart on the bullet?
Looks like yet another great way to kill the guy from septic shock 5 days after the shooting.
best I could figure is 108,000 RPM at the muzzle but I could be doing it wrong. Here is where I found the calculation, Calculating Bullet RPM ? Spin Rates and Stability « Daily Bulletin
Even with that hole saws keep spinning at a relatively constant rate to do their cutting, this bullet should stop spinning pretty quickly upon impact. So, the hole saw effect is probably minimal.
Im surprized no body has brought up the legal aspects, hollowpoints are one thing but this thing looks nasty and we all know what happens when something just looks scary.