Thanks for the info guys,
The question was related on the bullet to be able to expand as fast as possible and to do maximum damage on the internal organs.
We have many discussions up here (Québec, Canada) when it comes to bullets beeing able to open up on time and do major damage to the vitals. Some of us have tried Winchester Vital shock, and that bullet unless it its bones, will not open up and will just go straight through without doing major damage. None of us here have tried this new Power max, but the way it's made, we all think it would do the job, just no experience with it yet.