Everyone here knows you need at least a 180 gr monolithic bullet fired from at least a .300 Winchester Magnum, preferably a .300 RUM at 3200 fps minimum, to kill a 100 pound whitetail. Deer have gotten much tougher since the 1960s when a .30-30 (and cheap cup and core bullets) could be used. Back then the big argument was 150 grain vs 170 grain bullets.
