I talked to an exec at Hornady and he told me that one of the design objectives of the new .30 cal bonded bullet is to have it open quite quickly, within three inches or so, to get maximum performance on deer sized game. No doubt the bonding will retain bullet weight for good penetration. He told me that initial test have indicated that the bonded bullets are slightly more accurate than similar non-bonded bullets - the engineers have some speculation as to why, stuff involving the method of inserting and holding the cores etc. I have shot some of the other bonded bullets and they penetrated seven to nine inches before really opening up, jugdging by the wound cavities in our test medium. I expect that Hornady is right-on designing this bullet with deer in mind as no doubt more deer are shot at than any other big game species. Fact is, many hunters are wasting money and bullet performance by choosing relatively tough, deep penetrating premium bullets for whitetails. They are doing 150 and 165 .30 cal bullets right now, expect they will be out very soon. Minus 24 this morning, little cold for shooting at the range.