These are Bonded Core Bullets, meaning they are 'suppose' to not separate from the Copper Jacket at All, simmilar to the make-up Nosler Accubond. The Partition, being a framed bullet it not guilded to the outside jacket.
In a 300 Win Mag moving a 180 grain projectile at 3000-3100 fps, I would suspect any North American Game would fall to this. I know they have fell when I have shot them with 180 gr Partitions, Gamekings, Interlocks and Accubonds.
I typed in Google "Hornady Interbond Facts" and this is what came up:
http://ww w.hornady.com/media/InterBond_Bullets.pdf
It outlines comparisons with the Partition and Grand Slam between 150 and 165grain, it also shows penetration. In regards to Penetration, the Interbonds do not penetrate as deeply in Ballistic Gel as the Barnes, Partitions etc. BUT the difference is between 19" for the IB and 24" for the Nosler and Barnes. Last Time I checked 12 inches was more than enough to get into the boiler room of Captain Swamp Donkey. Barnes always is carrying on about penetration, however penetration is also related to the energy which the bullet sheds when it goes into media (flesh, gel). If the IB doesnt go as deep into a cavity it therefore sheds more energy to the surrounding media in the wound channel than a bullet that just keeps on moving on up to the east side. This may, however, differ with actual 'killing capacity' that can only be experienced in the field.
I have Shot the Interbonds at Targets but never on game, I have had great experience with the Partitions. I do have a story though that I would like to share.
Last Year, one of the members in my elk hunting party creeped up to a group of 4 bedded elk early in the morning fog. When the animals finally winded him, the bull in the party stood up in the thick timber. The hunter stood up, took aim at 15 yards and let a shot go with 165gr Interbond in the 300 Win Mag. It turned out the bullet 'shaved' the bark off of a sapling comming out of a log where the elk was standing. Fortunately, the bullet stayed in tact, and the animal was recovered about 40 yards away. The Bullet stopped on the far side of the Bull's hide, mangled and mushroomed. Lucky, considering bullets usually change direction when they hit limbs!
Your questions, how does it compare?
Physically- the bullets are built differently, The Ford and Chevy crowd could argue which is better until the cows comes home.
Actually- Because of the Velocity of the 180grains in the 300WIN MAG, anything you shoot in the vital area will die.
Try the IB's out. If they don't do what you want, never use them again and BASH them! If they work out and you are happy, Praise them!
Good luck on the coming season.