These might help
http://parkerguns.org/forums/showthread.php?t=12593
https://docs.google.com/a/damascuskn...QzuYRuLvs/edit
Scroll down to:
Damascus Mythology & Reality
Damascus Quality
Barrel Strength and the 1891 Birmingham Proof House Report
Turn-of-the-Century Shotshells, Powder & Ballistics
Barrel Evaluation Recommendations and Non-Destructive Testing