12 has a bigger bore.
The gauge of a shotgun is directly related to the size of the barrell. In the cases of shotguns the sizes going from biggest to smallest for 'standard' (not all) shotguns is. 10 gauge, 12 gauge, 16, gauge, 20 gauge, and a .410 bore shotgun (410 is not a gauge but a caliber)
The lower the gauge the heavier, sheet metal, wire & shotguns...
These shotguns came in 20, 28, 16, And 12 gauge calibers
Manufactured between 1886 and 1916. Retail value $50-$75 unless in like-new condition.
12 gauge shells.
Numerous companies in many countries have made single shot 12 gauge shotguns.
Remington has made many thousands of 12 gauge shotguns in dozens of different models/configurations.
1880s to 1940s
The military does not mount 8 guage shotguns on boats. Sometimes shotguns are CARRIED aboard boats, but those are 12 gauge. Afraid you have been given some bad information.
I can say that Browning started having shotguns made in 16 gauge in the year 1909.Winchester started having the model 12 shotguns made in 16 gauge in the year 1914.so I would surmise that the time frame of 1909-1915 would be the correct time frame for the introduction of the 16 gauge shotguns.
a 20 gauge is a type of many shotguns but it is smaller than a 12 gauge but bigger that a 410. a 20 gauge is a good shotgun for all ages.
Winchester Model 12 shotguns in good condition can fetch prices from $500 up. 12 gauge is the most sought after size.
Built c. 1930-1948 by Stevens division of Savage Arms. If in useable condition, possibly worth $200+.
about 200 dollars
J. Stevens Arms Company
Prices can vary from a few hundered to tens of thousands.
model 158 12 gauge shotgun
Eatons of Canada
I have just seen this set on gunbroker.com