IMHO the WW is just a copy of the Snuffer with a tweak so "they" look like "they" did not copy the real thing. Every thing I have shot with 145 grain Snuffers had a entrance wound and an exit wound. WW's are probably a good head but if it ani't broke why fix it. Snuffers work for me! If they are SHARP and in the right place you have nothing to worry about. Course you can say that with all the other heads too I guess.