By structure I'd like it to be Cairo but it doesn't look familiar all ... well, except for maybe the shade of your shooter here which you thought might be Cairo and then it was ID-ed as Champion.
http://marbleconnection.com/topic/6731-mostly-pix-champion-agates/?p=188642
That shade is very puzzling to me. I feel like we're taking stabs in the dark. If anyone has the light, I would love to learn more.