Seriously, just stop. I suspect that you have very little hunting experience because if you did, you would not reference "killing power" or "kill faster". Get off your armchair and get out and hunt. With time, you will gain some insight and wisdom and stop with your silly immature posts.
Just so other posters don't think I am blowing hot air, there is a very large on-going government funded study in Northern Europe on the effect of cartridges on moose (and so-called killing power). They measured the distance from where the moose was shot to where is laid down. They also took into account shot placement as a variable. Here is a link to the results graciously translated into English:
http://www.kifaruforums.net/showthread.php?t=10343
I understand there are problems with said study in inferring any kind of conclusion regarding "remote wounding" or other terminal effects or variables such as bullet construction, etc.. However, what can be said, without doubt, because there is a large enough sample, is that the chosen cartridge, from 6.5x55 to 460 Wby Mag has very little practical effect on killing power when it comes to soft-skinned game in normal hunting situations and when the shot is placed appropriately. This coincides with my own experience.
While I still hunt with different cartridges, it is usually because the cartridge/rifle combination best suits the type of terrain I am hunting as opposed to the type of game--generally speaking.