Bonded Bullet
A bullet whose jacket is chemically bonded to its lead core so the two stay together for high weight retention on game.
A bonded bullet is built so that the copper jacket and the lead core are fused together, usually through a soldering or electrochemical process, rather than simply held by friction and crimp. The bond keeps the core from shedding away from the jacket when the bullet expands, which is the failure mode that can rob a conventional jacketed soft point of penetration on heavy game. The result is a bullet that mushrooms reliably yet retains most of its original weight.
In terminal ballistics terms, bonding trades a little of the violent early expansion of a frangible hollow point for controlled, deep penetration and high retained mass. That balance makes bonded bullets a popular choice for big or tough animals and for shots that may pass through heavy bone, where a bullet that comes apart too soon would stop short.