Go to
www.16ga.com---the 16ga society and onto the reloading forum. You will find a variety of posts from spr310 and can go to spreadsheets with 100's of 16 ga loads. You can put in you8r hull type or your wad and get many good loads. There is also a spreadsheet of low pressure loads which is invaluable. I have all 3 on my computer favorites and can bring them up in seconds.
I use the DR16 wad with 7/8oz loads in my 16's, using low pressure loads with either PB or green dot powders, loading 2 3/4" Rem. Game Loads. Personally, I dont see the need to mess with cutting shells down to 2 1/2, but the RST's are great shells.
I also load 12 and 20's with light loads and they are just fine for clays and grouse size birds---and there is a hell of alot less recoil.
Shoot straight and shoot often.