Here's a couple of sources that cite information from the IWBA:
http://www.firearmstactical.com/briefs10.htm
http://ammo.ar15.com/project/Self_De...N%20AMMUNITION
The conclusions are that due to number pellets, velocity, and cross sectional density, the #1 buckshot seems to be the best choice for close range defense. However, that IWBA recommendation does not include commonly encountered barriers in police use such as windshields. For a "duty" load, 00-buck with copper plating is a superior choice as it will penetration those barriers and still maintain good penetration. The weakpoint of shotshells is penetration, and what pellet size you use depends on your environment. For home defense, #1 buck is ideal.....for police use, 00-buck is better.
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