bonded bullets

[kcub]

How do they bond copper to lead such that it survives high velocity impact and mushrooming?

[hooligan1]

Heat.

[T. O'Heir]

Heat and mechanically by the type of jacket shape.
Surviving high velocity impact isn't as big a deal as it sounds. When a bullet hits say, a deer, it doesn't stop or even slow down much. It penetrates and starts creating hydrostatic shock that makes it expand, if it's designed to expand, along predetermined weak points in the jacket.

[jmr40]

The bonded bullets aren't really needed for deer or smaller big game. Or for even bigger game as long as larger caliber, heavier standard bullets are used. Bonded bullets will allow smaller calibers and lighter bullets be just as effective on much larger game as the old school methods using bigger, heavier bullets.

The best bullets for such uses are the solid copper bullets. No worries about the copper separating from the lead.