A lot of people somehow think a Swift A-Frame will out-penetrate a Nosler Partition of equal weight and diameter, because the Nosler loses "more" of the front core. This isn't so, because A-Frames are relatively soft all over, since they're made of pure lead and copper. Also, only the front core on AF's is bonded. Consequently the entire bullet often expands, including the rear core, resulting in a wider bullet, which reduces penetration.
Also, the .375 Partitions are among the heavier models with the partition moved forward, so they retain a higher percentage of their weight. The few 300-grain .375's I've recovered average 87-88% weight retention.
