Head on over to
Ballistic Products. They have tons of loading data/info and even books to purchase for loading steel.
Specifically, they have a manual titled
Status of Steel that I have heard good things about. A friend loads some duck loads and for the longest time he quoted their velocity to be around 1900 fps. I know it's hard to believe, but I chrono'd 'em....1850 fps. Damn amazing and from what he says, it just crushes waterfowl out past 60 yards.
Best of Luck
Ed