Hi Steve,
Well I found it in the second DeHaas book, "More Single Shot Rifles and Actions" It has both the Meridan #6 and #10 listed. I don't have a scanner, so I'll have to snail mail.
*A note from DeHaas' book in the Meridan section states the actions are nearly identical to the Hopkins and Allen #722 action. He mentions they are so similar that he thought H&A made the guns for Meridan.
If you'd like a copy of this section of the book, send me your mailing info, and I'll copy it for you. The DeHaas books are invaluable if you have any interest in single shot rifles in general.
Sounds like your 1894 project should make an interesting chambering. I'm afraid I must admit ignorance of the .357 B&D? I don't know what the B&D stands for? I'm a bit antiquated, (like my guns) mostly old pre 1900 Marlins and single shots, so a number of the newer chamberings are Greek to me!