RESULTS ARE IN! And many thanks again to all who donated barrel segments, esp. Dennis Potter. I'm saving some of the good stuff for the article but:
1. The findings were remarkably consistent
After discarding the highest and lowest mean:
Twist - 53,300 psi
Crolle - 54,500 psi

2. Four 125 year old samples, Twist and Damascus Twist - 51,500 psi. I guess the mythical delaminating, rusting welds and voids don't really weaken Pattern Welded barrels over time smile

3. As Steve Culver predicted, the JABC Twist barrels were just as strong as the crolle samples.