Any sporting goods store should have at least a few boxes of 10 gauge shells, but probably not a large selection. You have a shotgun that is between 76 and 119 years old in 2006. Before you buy any ammunition, have the gun checked by a competent gunsmith and if he approves it he should also recommend the proper load. Even the oldest of these Winchesters should be OK with smokeless powder, but I doubt if any would stay together through a box of heavy magnum shells.
With the serial number that you have provided,your Winchester model 12 pump action shotgun in 20 gauge was made in the year 1930.
Your Winchester model 1912 pump action shotgun was made by Winchester in 1917,with the serial number provided.
The Winchester model 1901 shotgun was made between the years 1901-1920.
Your Winchester model 1912 pump action shotgun was made in 1917 with the serial number that you provided.
With the serial number that you have supplied,your Winchester model 1912 pump action shotgun was made in the year 1959.
with the serial number that you have supplied,your Winchester model 12 pump action shotgun was made by Winchester in the year 1937.
You do not say which model shotgun you own?So I will say that if you have a winchester model 12 pump action shotgun then it was made in 1953.This is the only winchester model shotgun with a serial number that high.
No browning did not,but winchester made a ranger model pump action shotgun.
Your serial number indicates that your Winchester model 12 pump action shotgun was made in the year 1935.
With the serial number that you provided,your Winchester model 12 pump action shotgun was made in 1927.
With the serial number that you supplied,your Winchester model 1912 pump action shotgun was made in the year 1914.
Your Winchester model 1912 pump action shotgun was made in 1916 with the serial number that you provided.