OK - thanks for the info, guys. Apparently Doc et al have decided to try to market their bullets with gas checks for ML's, claiming that they will "scrub the bore between shots, making cleaning unneccesary".
And - they also have the Powestars, which are exclusively for ML use.
Just part of my ongoing quest for bullets that I can use.

Here's a like to the site if you want to see it:
http://www.whitemuzzleloading.com/white_bullets.htm

IM jaybe