ORIGINAL: popeye
XP3 is a bullet classification used by Winchester not the specific bullet. I tried a 270, 140 gr FailSafe several years ago. One shot, one deer...not much experiance to draw from but it worked well. IMO a XP3 class bullet are more than is needed for whitetails. After all, dead is dead.
Actually the failsafe was discontinued a few years ago and the XP3 is an actual bullet design that has taken its place. But you are right it really is more thenis needed for whitetail. I have know people who used then and the deer died just as quick and dead as a corlok. If its the bullet that shoots best out of your gun use it, if not then there is no need.