Since the mid 1960's we have been using the Sierra 120 spt in our 6.5's.for deer. Made no difference if it was a 6,5x55, 264 mag or 6.5x06. They have all been mature muley bucks. As this year I took a mature muley buck easily over 200 lbs. About 185 yds. One shot from my 260 with the Sierra 120gr. He went down on the spot. Bullet placement is every thing. If some one looses a buck it's generally poor bullet placement .It doesn't take some special bonded or partitioned type of bullet to take deer.Just properly placed..