if an H-Mantle bullet hits at high velocity, chances are the partition will rupture when that happens penetration stops NOW!
a bonded bullet may hit at high velocity and become a mangled mess of lead and copper but it holds togather and keeps penetrating

the accubond pictured at far right was fired into a green hard maple tree at 3520 fps, it expanded to .658 and retained 63% of its weight, as my dad would have said, a partition couldn't have made that trip.
This is the only accubond I've ever recovered, and I've taken around 30 head of game with them.
RR