Here in Scotland I have used a 1400 on and off for 35 years.I usually cycle the action to extract the cartridge in the chamber by pulling back the "cocking bolt"as far as it will go.Normally then the next cartridge in the magazine will "jump" into the chamber preparatory to being chambered in the barrel. You can then extract the cartridge by hand .If there is another cartridge in the magazine you would require to close the bolt by pressing on the magazine follower and then pulling back again on the cocking bolt to bring the cartridge in to the chamber for extraction by hand. A great gun!
Best to ask a gunsmith.
Winchester did not make a model 96 shotgun,they did make a model 97 shotgun however.
If you can't unload it by cycling the action, TAKE IT TO A GUNSMITH!!!!!!!!!!!!
your winchester model 1200 shotgun has a pump action.
Your winchester model 12 shotgun was made by winchester in 1947.
Your winchester model 12 shotgun was made by winchester in 1922.
your winchester model 12 pump shotgun was produced by winchester in 1942.
your Winchester model 12 shotgun was made by Winchester in 1959.
your Winchester model 1897 shotgun was made in 1916.
your Winchester model 1897 shotgun was made in 1910.
Your winchester model 1897 shotgun was made by winchester in 1927.That makes your shotgun 84 years old.
The Winchester model 1200 shotgun is a pump action shotgun.