Quilly, Like Larry said if you got 100 deer that were wired exactly the same and responded the same and you hit to within .001 of the aiming point on all 100 deer with the same bullets you would have a leg to stand on and say that this bullet did this when it hit the deer in that spot. I think in that situation a 150 partition would be better than a 180 partition because there is less resistance in a deer that weighs 100-250 lbs than there is in a 800 lb elk or a 1200 lb moose..You would want a quick opening bullet. Want to drop one on the spot shoot it close and hit the shoulder(wasting meat in the process) or attempt a neck shot(TV guys do this all the time) and risk wounding a deer and making it suffer a painful death. Shooting deer anyway with a 270 win they usually drop in a heap with cheap 130 grain Corelockts then when I use a 300 mag on them with 180 hornady bullets they run off to the races and drop 100 yards away. MOst of the time I shoot relaxed deer so I don't know what gives sometimes either.