There are conversion cylinders out there, check midway usa and dixie gun works. they are maker and model specific The only no no is brass frame revolvers, they should not be converted due to the weakness of the frame. In a very short time the brass will distort enough to become very dangerous and in some cases have catastrophic failures.
Most likely its the serial number
It will depend a bit on the individual revolver, but around 15 grains per cylinder is probably a good place to start - then if that seems lighter than you'd like when shooting, you can gradually try increasing the charge. So long as you load properly and the gun is in good condition, you can't really go wrong with black powder - you can put in as much as the cylinder will hold, leaving room to seat the ball properly, and it should be ok. If you want to put in a lot less than the cylinder holds, you may need to use a wad or filler of some sort between the powder and the ball, since the ball must be seated on the powder with no air gap between. It is always a good idea to fill the cylinder over the ball with lubricating grease of some sort ('Bore Butter' of other similar purpose-made lubricant, or just Crisco or similar), since apart from providing lubrication and keeping the fouling soft, this also guarantees a good seal of the chamber, preventing 'chain fires' which might be caused by the explosion of one cylinder igniting the adjacent cylinders (which is certainly not pleasant, and could be very dangerous).
That would depend on Mr. Ormsby's reputation in the engraving community, whether it was done at the factory or after market and overall condition of the piece.
50-180 or so Way too low. The EIG Schneider & Glassick .36cal. replica was the first replica Schneider & Glassick imported in 1963. This in it self puts it in a collector category. These revolvers are appreciating fast. Last sales were between $200-$300+.
The best way to determine actual value is to search the on-line auctions, such as www.gunbroker.com and www.auctionarms.com or even www.proxibid.com enter your details in the search and see what is selling and for how much. You can also search the archives and or sold items to get an idea of what your gun is selling for. Another place to look is The blue book of modern black powder values, available from www.midwayusa.com and www.bluebookpublications.com as well as many of the other hunting and firearm stores. That will give you an idea of the general value. Guns tend to have some regional value too, say a Thompson Center Seneca may be worth a bit more in the north east than in the mid west,and a Ruger old army may sell higher in the northwest than the east coast. Don't forget condition has allot to do with value, so compare apples to apples.
value would depend on overall condition and weather or not it is an original 1851 or a re--pro model. read the top of the barrel. the 1851 was a cap and ball type of pistol...........
Hawes was an importer of replica percussion revolvers. The brass frame .36cal. with an unengraved cylinder is actually a replica Confederate Schneider & Glassick. There are only three original Schneider & Glassick revolvers known to exist. Value of the Hawes replica Schneider & Glassick would be $200-$300.