Let me get a little more involved here. Not because I don't believe what is being said but i've got to take sides out of personal experience. I used to shoot the 300 grain Hornady XTP over 90 grains of pyrodex RS. It shot beautifully. Very tight, tight groups, often with bullets overlapping each other. But, I couldn'tshoot and finda deer with the friggin things. From what i gathered, they wouldn't expand in thedeer. Maybe they take too long to expand, I don't know. I could find blood for 15-20 yds, then nothing. My hunting partners and i searched for 2-3 hours for each deer I shot and still nothing. I searched forums and was told to try the precision rifle dead centers. I was reluctant to shoot only a 220 grain bullet but hell, I couldn't do worse than what I had been doing. I changed to 80 grains 777 powder and the 220 grain dead center. WOW! The 1st 2 deer I shot with them fell over immediately and the 3rd (heart shot) ran about 40 yds or so straight toward me with blood spewing out of her until she collapsed and died right at the base of my tree. So, as long as the bullets expand well and hold together I think they are performing optimally. I don't really have an opinion on overexpanding but if they expand all the way to the base and hold together I think it would be fine. I was concerned about the all lead bullets but they hold together great. They expand almost down to their bases but continue to mushroom and push through the deer and cause damage that is lethal, lethal, lethal. Here are the bases of the bullets pictured in my 1st post as well as a "before" picture of the 220 grain dead center.