The Blue Book of Gun Values, which can be confusing (daunting?), and The Standard Catalog of Firearms, or Flayderman's Guide to Antique American Firearms, are good places to start (often appearing at a library near you). First, as you'll find, the weapon needs to be "graded" (See NRA Condition Grading Definitions... (http://www.oldguns.net/ ) Remember that these are only "guides" to help determine assumed worth of a weapon; real "value" (price, actually) is determined by the amount someone is willing to pay for the piece and your acceptance of their offer. If you are serious more than curious, take it to a "real" (certified) appraiser (or at least two to get, like, a Dr's "2nd opinion" because "your mileage may vary").
Winchester never chambered the model 1894 rifle in 50 caliber.The largest caliber in the model 1894 rifles history was the 38-55 WCF.
Your winchester model 1894 rifle which was made in 1936 is selling for between 400-650 dollars in the condition you described.
With your Winchester model 1894 rifle being made in 1956.A pre-64 model 1894 rifle will sell for between 350-500 dollars depending on overall condition and a good bore.
your Winchester model 1894 was made in 1980,as such it is valued at 300 dollars depending on condition.
Your Winchester model 1894 rifle which was made in 1957 will bring between 300-500 dollars in the condition that you describe.
Your Winchester model 1894 made in 1950 is going for between 375-500 dollars depending on condition.
Your winchester model 1894 was made by winchester in 1964.
your Winchester model 1894,which was made in 1955 is going for between 250-375 dollars depending on amount of original finish and condition.
your winchester model 1894 is worth between 250-350 dollars depending on overall condition and a good bore.
Your 1941 produced Winchester model 1894 is going for between 350-500 dollars depending on condition of the rifle.
A Winchester model 1894 ranger in that condition is worth 395 dollars.The serial number indicates that your Winchester model 1894 ranger was a first year made rifle.It was produced in 1985.Winchester made the ranger model from 1985-2006.
A winchester model 1894 rifle made in 1971 is valued at between 250-350 dollars depending on the overall condition and a good bore.