The lead core is fused or "Bonded" to the outer jacket. After impact there is less chance of the core separating from the jacket. This means better weight retention and greater expansion and penetration.
Some jackets are just formed around the core and can separate after impact.
... and Bates - I would argue that bonding the jacket has nothing to do with expansion. It seems to me that would be more a function of the lead core alloy and speed.
Depends on the brand and the bullet in question. "Some" bonded rounds were designed specifically to expand and keep maximum weight. Barns had some IIRC.
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