Thank you for conducting the gluten mass test on the Kyrol high-gluten flour. I have updated (below) the Master list to include the Kyrol flour. I believe that the Kyrol flour is 13.8 +/- 0.3% protein. If that turns out not to be right, I will correct the Master list.
Master Gluten Mass List (as of 3/22/12)
KASL (King Arthur Sir Lancelot): 4.1 ounces, or 116.235 grams (14.2 +/- 0.2% protein)
All Trumps (bromated, bleached): 3.81 ounces, or 108 grams (14.2 +/- 0.3% protein)
Power (Pendleton): 3.8 ounces, or 107.73 grams (13.0 +/- 0.3% protein)
Kyrol (bleached, bromated): 3.74 ounces, or 106 grams (14.0 +/- 0.3% protein)
ADM Gigantic: 3.42 ounces, or 96.89 grams (14.0 +/- 0.3% protein)
KABF (King Arthur Bread Flour): 2.68 ounces, or 75.978 grams (12.7 +/- 0.2% protein)
Caputo 00 Rinforzato: 2.66 ounces, or 75.43 grams (12.5 +/- 0.50% protein)
Caputo 00 Pizzeria: 2.54 ounces, or 72.12 grams (11.5-12.5% protein)
Mondako (bleached, Pendleton): 2.354 ounces, or 66.75 grams (12.0 +/- 0.3% protein)
Better for Bread (aka Harvest King): 2.306 ounces, or 65.3751 grams (12.0 +/- 0.3% protein)
KAAP (King Arthur All-Purpose): 2.297 ounces, or 65.11995 grams (11.7 +/- 0.2% protein)
Ceresota All-Purpose: 2.114 ounces, or 59.93 grams (12% protein)
Caputo Extra/Blue 00: 2.06 ounces, or 58.38 grams (11 +/- 0.5% protein) (Note: expiration date of flour = 2010)
You are correct about variances in protein content from region to region. There are many factors that come into play from a flour protein content standpoint. These include the wheat cultivar, the growing area, the growing season, the weather and the time of harvest. Millers try to adjust for these factors as best they can through blending of different flours, with the objective of delivering a product to the end user that does not differ materially over the course of the year. Of course, there are limitations to this since so many factors are beyond the miller's control. Fortunately, in the U.S., we are amazingly blessed from a geographical standpoint. The American Midwest, where wheat and many other crops are grown, is the world's largest contiguous piece of farmland. So, we have choices and options that no other country in the world has.