They are available in 2-3/4 inch, 3 inch, and 3-1/2 inch.
Many fine 20 gauge shells are made.
The length of the chamber in a 2 3/4 inch chambered shotgun is 2 3/4". The longer 3" shotgun shells will not fit in the chamber, being 1/4" too long. You can shoot 2 3/4" shotgun shells, of the correct gauge, in a 3" chambered shotgun.
The life of the ammunition should last pretty long if kept out of the element, for example i shot some 12 gauge shells that have been out in my shed for almost 10 years and they still shot.
You can't. The 14 gauge has been obsolete for over 100 years, and the shells are found only in the collections of advanced shell collectors. I have been collecting for 30+ years, and have 2 of them.
16 gauge, 2 and 3/4 inch, any shot from fine birdshot to buckshot.
Depends on what size shot, what size shell, what gauge shotgun, how good of shot you are and what choke is being used.. Generally 0-35 yards maybe more maybe less depending on all the above
yes 2 3/4 shell will work in a shotgun chambered for 3in as long as they are of the same gauge
You could eaither shoot dove with a 20 gauge shotgun or a 12 gauge shotgun. You should also use a bird shot shells
A Victor 12 gauge shotgun typically uses 12 gauge shotgun shells, which come in various lengths, such as 2¾ inches or 3 inches. The exact size of the shell may depend on the specific model and its chamber length, so it's essential to check the manufacturer's specifications. Always ensure to use the appropriate shell type for safety and optimal performance.
Check the markings on the barrel
No
Most shotguns of this time period will have a full choke.As to the shells,I would hold the power down to game loads(low brass)16 gauge shells due to the inheriant weakness of the steel over time and as constructed back during that time span.