I only hunt with two bullets in my 7mags,the 150gr Ballistic Tip and the 160gr Accubond.I've used both bullets with 100% one shot kills.I get just a little bit larger wound channel and quicker kills with the Ballistic Tip because it sheds just a little bit more weight.I've been getting 100% exits on both bullets so it's hard to tell how much difference in retained weight.I'm sure if a lot of bone contact is made that is where the bonded bullet would really be an advantage.Nosler came out with the 160gr Ballistic Tip that I bet is a really great bullet too.This is from Noslers FAQ's
Externally, they look the same except for the tip colors, Ballistic Tip® bullets are color-coded by caliber while all AccuBond® bullets have white tips. Internally the Ballistic Tip® is not bonded and is designed for controlled expansion on medium game with approximately 50-60% weight retention. Conversely, the lead alloy core of the AccuBond® is bonded to the jacket. This bonding increases weight retention (65-70%) and slows expansion resulting in deeper penetration and enhanced bone-breaking potential in larger animals.