The Accubond was only released 9 years ago, so I'm presuming you are combining your Partition and Accubond experience into one big pool. The Partition isn't a "bonded bullet", but is definitely a very consistent performer, even if it's not often one-hole accurate. In my admittedly limited experience, the Accubond IS very accurate, with 1" groups at 100 yards not too difficult to attain.
Shooting southern deer with 300 Magnums may not be the best test of terminal performance because, as you stated, every single one is a pass through. No surprise there, but I do wonder if you were to be fortunate enough to harvest a like number of elk, or nilgai, what the results might be. As Nick stated earlier, Sierra did some testing and came to the conclusion that whatever differences might be quantifiable, they aren't enough to justify changing their extremely accurate bullets. For light, thin-skinned (CXP2) game, I'm not sure the bullet matters much at all, so excellent accuracy is something to consider as a defining characteristic.
Shooting southern deer with 300 Magnums may not be the best test of terminal performance because, as you stated, every single one is a pass through. No surprise there, but I do wonder if you were to be fortunate enough to harvest a like number of elk, or nilgai, what the results might be. As Nick stated earlier, Sierra did some testing and came to the conclusion that whatever differences might be quantifiable, they aren't enough to justify changing their extremely accurate bullets. For light, thin-skinned (CXP2) game, I'm not sure the bullet matters much at all, so excellent accuracy is something to consider as a defining characteristic.
