Sorry, again, to add this so soon.
This link:
http://www.uberti.com/firearms/walker.php
look under the 3 pics and says "designed to hold 60 grs. BP, etc."
Then look at this one, to see how wimps cover their asses:
http://www.dixiegunworks.com/product...oducts_id=1022
"Recommened load is 25 grains of 3F black powder, .454 round ball, and a .44 caliber revolver wad."
I'm not sure you could seat a ball with 25 grs of powder in a Walker. Rammer has limited travel. Uncompressed charge with BP.
Cheers,
George