According to Ruger " The new Army is not currently in production" I couldn't get an answer as to weather or not it would be again. They also said that parts and new guns are still available from there dealers.
I bought a Ruger "Old Army" black powder revolver in 1974, which is based on the Black Hawk frame and it came in a RED box with the White Ruger logo. Most Rugers came in a box like that.
You can look up the serial number on ruger's website
You can download the manual for the Old Army cap & ball revolver that has loading and cleaning instructions from the Ruger website (see related links) under the customer service heading.
I use 30 grains of 3f goex and a horady .451 ball with a bore butter seal over the top. Gives good groups at upto 25 yards. I have also used substitute black powder, worked well but not as reliable.
Chances are that if you overload the charge in a revolver style black powder pistol, you can blow up the cylinder or blow the barrel off the end of the gun.
Yes it is concealed, but not illegal because black powder firearms are not considered a "firearm".
The BATFE website has the answer.
22-72
You need to consult a Black Powder loading manual
In the technical sense no it is not loaded via the muzzle of the gun, black powder revolver is accurate as terms go, but they do fall under the blanket of "muzzle loader" in general terms.
There are none produced that I know of, a 209 primer would be over kill in a revolver due to the small chamber and lower amounts of powder.
black power or cartridge rounds? Colt made the first "practical" revolver, so this was the first commercially successful cartridge revolver. I can't say about black powder... but you should read this: http://en.wikipedia.org/wiki/Revolver <><><> The first Colt revolvers were black powder handguns. The self contained cartridge was invented later.