There is another thread going that has some good links but I'll be quick. The ballistic tip and the sst are both cup and core, as well as the accubond, but in the smaller calibers the sst and theballistic tips are thinner walled and are non bonded meaning the lead is not adheared to the outer shell. They explode on impact with little penetration. The accubond is also a cup and core but is bonded meaning the inner lead is attached to the outer shell and on impact the bullet mushrooms for deeper penetration and are designed for a 65 percent retention for hammering in deep. Now, the partition is an H frame and is non bonded. The top part of the bullet does mushroom fast but the lower part of the H holds the bullet together to push it deep. Clearly in the smaller calibers on elk you need penitration not a big splat on the front shoulder with no penitration to the organs. Now on the larger calibers/cartridges the ballistic tip and the sst have thicker outer shells and may hold together better if the speeds don't get out of control or what they are designed for. I still won't use them in bigger stuff. The write ups in the other thread are worth the read. Both of them go through cupband core as well as most common bullets with their individual characteristics.
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