I would seriously question the accuracy of the data presented in this catalog. For a 50 gr varmint bullet, that is considerable penetration. Does it happen to specify the barrel length of the weapon it was fired from, the velocity or the distance to the target? If not I would be highly suspicious of this claim. The Winchester Ballistic Silvertip is nothing more than a Nosler Ballistic Tip. Nearly every ammo company has a load using this design. From everything I have seen before it would seem much more reasonable for this round to have penetration in the 6" to 9" range. Perhaps they fired it from a very short barrel weapon such as an H&K with 8.5" barrel and the ammo didn't exhibit it's normal "explosive" character. That would be a huge difference in penetration/fragmentation performance compared to a 16" or 20" barrel.
-Charging Handle