I think you can check with the museum in Cody, Wy.
Yes. the model 1893 was made for black powder. Model 1897's were made for smokeless and replaced the 1893. Both black powder and smokeless were used for many years, side by side. People got smart and started only buying smokeless shells, easy to clean.
Your question is difficult to answer because there is no "20-20" Winchester. The model 1894 was the first rifle available in the new smokeless powder 30 WCF cartridge (Winchester Center Fire) aka "30-30". If this is actually your rifle it was manufactured in 1913.
Nothing, really, but the name of the cartridge. When Winchester introduced the Model 94 in 1894 in the brand new smokeless powder round .30 Winchester caliber, most of the other ammunition on the market was black powder and had names such as 25-20, 44-40, 45-70, etc. These names stood for the caliber (diameter of the bullet) and how many grains of black powder were in the load. The .30 Winchester didn't follow that convention an dpeople didn't know what to expect, so it was not well accepted in the market and sold poorly. In a marketing move, Winchester changed the name to 30-30 (still, of course, a smokeless powder round with identical components as the .30 Winchester) and the guns and ammunition sold quite well.
Great care and caution have to be excercised when shooting old original guns. They were intended to be shot with black powder which isn't as critical in case capacities as it is with smokeless powders. It is quite subjective as to the terms of "condition" as it is referred to in the question. A tight Model 1873, that is in very good shape, with no rust or pitting, that locks up correctly can be safely shot with smokeless powder loads, provided it isn't loaded beyond what the safe pressure that is recommended by the manufacturer.
have you tried the Winchester web site
You can find information on when these guns were manufactured on OldGuns.net.
your Winchester model 1892 serial#206143 was made in 1902.
Could you please check your information and rephrase this question? So far as I can tell Winchester never made a model 1917 or a model 9330
The sears model 6c-22 was made Winchester/ same as Winchester model#490
The Winchester Model 12 16 gauge shotgun, with serial number 1779186, was made in 1918. This is according to the information released by Winchester.
Based on what I know, I believe you have a Winchester Model 1894 lever action 30-30. If 588313 is the serial number it was probably made prior to 1924. Depending on the condition of the rifle you have an exceptional firearm with a rich history. I recommend keeping it in the family. If you were to buy a brand new Winchester Model 1894 30-30 today it would not be half the firearm you currently have in your possesion. One thing you can do is to check on the barrel. If it says "especially for smokeless powder" then you have an original. If you are interested in the history of this particular firearm you can google Winchester .30 W.C.F. or Winchester 30-30. There is probably more information on this rifle than any other. As a caution there are a lot of people out there that would be more than happy to offer you a couple hundred bucks for it. Don't do it. Hope this helps.
The marking of the nickel steel barrel meant that the rifle could be fired with smokeless powder.This powder created more pressure than black powder.