Quickdraw,
I'm on a never ending quest for 2 1/2" reloading data. Pick up a magazine form Hodgdon reloading manual, there are a 1/2 doz. loads in the front of 12ga. data.
Ballistic Products in Minneapolis area lists several 2", 2 1/4" and 2 1/2" loads in thier "Advantages" loading manual and will send you a sheet or two of data with an order. Though currently out of print, BP has a "Care and Feeding of Fine Doubles" manual listed on the website. I suspect they are redoing the manual as BP no longer carries some of the wads listed in "Advantages". Anyone out there have an old copy?
Precision Reloading out of Mitchell, SD will send you a couple sheets as well.
The big struggle I'm having is staying under 6000# with most published loads. If anyone out there has some proven data, I'd sure like to see it.
Good luck, would be happy to share with you if you contact me.
Steve