I believe the hourglass shaped one is lead coated with a copper wash. Federal makes 2 weights in the Barnes, one at about 1500 fps and one at 1900fps.
Brenneke makes the Super Sabot, which I believe is lead free.
Copper Solids seem to work really good for me, though, out of my Mossberg 695. I bought a bunch on sale for $6 a box a month ago. About 2" groups at 100. I have two I dug out of my dirt backstop sitting on my desk that look like they should be out of the ammo catalog, they expanded perfectly. Remington is coming out with a low recoil version at 1200 fps later this year.
I think Hevishot makes a lead free slug as well.
Can't think of any others, but try looking at midway and looking at 12 gauge 2 3/4" slugs and see all the options.
Good luck.