Check out the 16 ga. reloaders group. There's a bunch of 2.5" 3/4oz-1 1/4oz loads listed on the spreadsheets on the site. I think it's $20-25.00 to join the reloaders group. The URL listed will take you to the 16 ga Society site, and from there you can find information on joining the group.
http://www.16ga.com/Although I haven't tested the load yet, one I pulled from the spreadsheets is:
2.5" RST hulls
CCI209 primer
19.5 grains 7625
GU1621B wad
1 oz shot
I'll probably try this load tomorrow on a round of trap.
