I finally took the plunge and bought a Navy Arms today off of Gunbroker. Price was right at under $800.00, and it is claimed to be new-unfired. Since my 1866 is in 44-40 I opted for the same caliber in the 1860 - just seemed more authentic. I imagine I'll strip down the blueing and work on darkening the brass once it arrives. I prefer the older vintage look on my brass framed guns. In the mean time I'll be looking for some more cartridges! 
Howdy Brassmagnet!
Don't go out of yer way, the simple fact of shootin' BP is gonna take that shine off yer brass receiver and cartridges perty fast by itself!
About the bluing: Are ya trying to make the gun look 100 yrs. old? Or just gittin' the "new" off it? The reason I ask is that if you're tryin' to look like ya "belong" back
then, yer guns would've been fairly NEW - not all grayed out or brown. (I like the look of the "antiqued" guns, but since I portray a feller who is alive back then, my shootin' irons wouldn't look like they're 100+ yrs. old! See whut I mean?) I want my '66 to look about 10-15 years old - and well cared-for ... which I think it does. And it is.

Anytime you can make that trip to Indiana, be sure and let us know yer comin.' I ass-ume you'd be comin' to a Great Lakes Freight & Mining Co. shoot (not far from the eastern Indiana border just off of I-70) as opposed to a Scarlet Mask Vigilance Committee shoot near Martinsville, which is about 30 min. south of Indy. No matter: MANY of us belong to BOTH Indiana NCOWS clubs! We'd be proud ta have ya come a visitin'!