Great post Zhukov, put I'm gonna disagree with your statement about fragmentation.
Steel is significantly stronger than brass and the additional .005" thickness only provides additional strength to resist fragmentation. In addition, and probably more important is the lack of a significant cannular indentation on the Silver Bear. From what I've heard and read, the cannular contributes greatly to the fragmentation of the round.
You can clearly see how the cannular is pinched into the lead, distorting the jacket and crimping the lead. There is no similar indentation on the Silver Bear.
If you take a look at any of Tat's or Brou's postings on Ballistic Gel testing and fragmentation results, pinned at the top of the forum, you'll see that much of the fragmentation occurs at the cannular.
I could be wrong, but this is my feeling.
Other than that, great post!