Hi There was an article (which some say is flawed in how it tested) - which still makes a good read.
The closing paragraph I think ist the most important - It's all about your balls - not your lube in relation to chainfires !
quote "Remember: If you have loose fitting balls in your percussion revolver grease over the chambers will do nothing to prevent chainfires. The grease is blown away at the first shot anyway and if the ball combo is loose enough for a spark to pass it, well, no grease will prevent it from doing it. Use proper fitting balls!"
The full article
http://www.svartkrutt.net/articles/vis.php?id=13
Cheers
Roy