Both work. SST's are cheaper if that is important. The SST's will expand more rapidly, but that is not always a negative. On deer sized game a soft rapidly expanding bullet into the lungs will put game down faster than a harder bullet in the same spot. On game larger than deer, or from less than perfect angles the Noslers will penetrate better. But between the BT and SST the difference is not that great. They are similar, with the BT being a little tougher.
As someone else mentioned the Nosler Accubond is the tougher bullet. It combines the aerodynamics of the BT with the penetration of the Partition.
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