I like that Boss stuff because I don't have to worry about breaking a tooth on it. It worked well for me on some ducks and geese last fall. Tooke a couple honkers 40 yards up with 3" #3 Boss Bismuth. Can't say they wouldn't have been just as dead with steel. I stoned several geese around the same range with steel #2's the day before.
I'll second the Boss stuff. I switched to them last year and while unfortunately I didn't get to use them as much as I'd like, everything I shot was done for. I'd like to say I had less cripples but that's all anecdotal.