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.
Great info John. I have an article by JvB on bullet performance. At close range, the A-frame penetrated less than the Partition... and expanded less. But had a MUCH higher weight retention (99.5% vs 68.8%). This was confusing until I read your post above.
Jason
