Was surfing the web on 6mmBR.com in the Daily Bulletin is showing a cartage comparison guide can be had as a book for purchase and also on the web for subscription covers all known ammo BUT no wildcats.
My self i subscribe to AmmoGuild http://ammoguide.com/cgi-bin/ai.cgi?sn=LgZCLJsghQ has also an ammo comparison guild haven't used it much but i think it covers wildcat cartridge's, can be tried as a guest log on