Gerry,
We don't have much in the way of grouse out here, but I do hunt with doubleguns and I never drink light beer...

I am also interested in a short (2" or less) 5/8-3/4-7/8 oz 12g loads for quail/dove.
I'm looking into getting some different wads to cut down as mentioned above. Ballistic products has a pretty good selection of wads, including one that is tailored for the 2 1/2 or less shell. I'm thinking of getting a bag of these and cutting them down further.
http://shop2.mailordercentral.com/bpicart/I'm thinking of starting with this one or one without a cushion.
http://shop2.mailordercentral.com/bpicart/prodinfo.asp?number=072SSWFor me, this just about having some really light loads for my old light 12g guns that have loads comparable to a 28g or 410 for quail/dove. Also the "cool factor" is a driver.
Agullia has a 1 3/4" shells, but they run between $9 to $12 on the market for a box.
I have a chronograph and a PressureTrace to measure the pressure for this kind of work. But my new laptop has been a problem with the PT.