Recommended that a gunsmith do this.
Your winchester model 1400 holds 3 rounds of ammo.(1 in the chamber,and 2 in the magazine.)
the model 1400 holds 3 shells. 1 in the chamber and 2 in the magazine.
To unload a Winchester 1400 20-gauge shotgun, first ensure the safety is engaged. Open the action by pulling the forearm back, which will eject any shells in the chamber. If there are additional shells in the magazine, press the magazine release button and manually remove them. Finally, visually inspect the chamber and magazine to confirm the shotgun is completely unloaded.
Three: one in the chamber, two in the magazine.
No, there is only room for 2 shells, ever. You cannot increase it's capacity.
Best left to a gunsmith
Remove the magazine tube cap. The plug is inserted inside the spring, and cap replaced. You may want to have a gunsmith do this. It will take less time for him to do it than it will for you to find the springs that got loose.
Yes to both
The Winchester model 1400 shotgun was made by Winchester from 1964-1981.
Do not do this as it will cause damage to the gun if you do so.
The limitation is because of a plug put into the magazine tube - typically, some sort of dowel rod. When hunting, you must have this. When not hunting, all you have to do is unscrew the end cap off the magazine tube and remove the plug.
the Winchester model 1400 was made from 1964 to 1981.