Some years back I copied this into a spreadsheet from a Shooting Times Mag in answer to a reader's question. Unfortunately, I do not know how, or even if it can be done, to make a spreadsheet line up properly here...It is though I believe fairly well readable. If anyone has other lengths that should be added please post them & I will add them to my spreadsheet. I am only interested in those from US makers. Interestingly while the most popular gauge, 12, had the most lengths available at 7 the 10 & 16 gauges both were only one short with 6 lengths.
Gauges & Shell Lengths From Early 1900s WRA Co Catalog
Gauge Lgth 1 Lgth 2 Lgth 3 Lgth 4 Lgth 5 Lgth 6 Lgth 7
4 = 4"
8 = 3 - 3 1/4" - 3 1/2" - 4"
10 = 2 5/8" - 2 3/4" - 2 7/8" - 3" - 3 1/8" - 3 1/4"
12 = 2 1/2" - 2 5/8" - 2 3/4" - 2 7/8" - 3" 3 1/8" 3 1/4"
14 = 2 9/16"
16 = 2 1/2" - 2 9/16" - 2 5/8" - 2 3/4" - 2 7/8" - 3"
20 = 2 1/2" - 2 5/8" - 2 3/4" - 2 7/8" - 3"
24 = 2 1/2"
28 = 2 1/2" - 2 7/8"
32 = 2 1/2"
.410 Cal = 2"
Later Lengths
10 = 3 1/2" Mag
12 = 3" Mag, - 3 1/2" Mag
20 = 3" Mag
28 = 2 3/4"
.410 Cal = 2 1/2" - 3"