Just thought I would alert everyone to Precision Reloading's manual called "Blanks to Supersonics". I purchased this manual about 6 months ago, and while I haven't had time to load any shells from it, I have browsed through the load data. VERY INTERESTING. Such loads as 2 inch, 12 ga, buffered, subsonic buckshot (I don't know if this is in there, but it gives you an idea). It truly is blanks to super sonics for all gauges. The only drawback is that some of the components (wads especially) are hard to find, conviently P.R. carries all of the wads used in the data. If you have an extra $30 (manual & S&H) laying around definately get one.
