that would depend on if the revolver was original or reproduction, makers name and condition
By asking the factory to check their records on that serial number revolver. It may cost for the research.
What is the grip made of?
givin your info id say .32 Rimfire (blackpowder)
Roughly 40 grains, but it will vary depending on round ball or elongated bullet. We would urge you to contact the manufacturer for an owner's manual for your revolver. Many makers have manuals available on line, or free for the asking from their customer service department.
On the underside of the frame
500 or so
Between 1910 and 1930. Many (all?) of these were meant to fire blackpowder cartridges only--Modern smokeless powder may not be safe, and it will accelerate wear to the gun.
i have found this old revolver in a pawn shop for 20 bucks how much is it worth
A bit of metal on the underside of the barrel. The ejector rod snaps into the lug when the action is closed.
Engraved and nickel plated Smith Wesson Model 29
Here is a link posted in the related links section, to the basics of loading a revolver. Remember to always keep your face and fingers away form the muzzle and the the open end of the cylinder. http://www.ehow.com/how_2074718_load-blackpowder-revolver.html
You will have to define what "large caliber" means to you and weather the pistol is a revolver, singleshot, blackpowder, rifmfire, centerfire, pinfire, semi-automatic.
Impossible to answer without a serial number.
50 or so
50- 5000 USD depending on the engraver, engraving, materials used, etc..
Anything from nothing to thousands of Dollars. There's no way to narrow it down more than that without knowing who the manufacturer is and what model the revolver is.
It all depends on several factors. Some of those old blackpowder pistols are gold inlaid with fancy engraving, while others were plain Jane guns, the same goes for the cap and ball revolvers. As for modern reproductions of the old guns, they're pretty much the same price. I have 6 modern reproductions, 5 are 1858 Remingtons and one is a double barrel percussion pistol and they were all around the same prices.
With an antique weapon, you will need to get a professional appraisal. I have seen weapons in an 'excellent' grading from this manufacturer, in 12 mm, offered for over $1200. But condition and rarity are key. Take it to a gun dealer that sells pre-1900 guns.
You will need to get a letter from Colt. They cost between 100-300 USD depending on exactly what you have.
Way to little information. What kind of Colt Revolver? Single Action Army? Python? Diamondback? What condition is it in? A set of new ivory grips with a steer head would set you back 800 or so.