12 has a bigger bore.
the price
No.
Crescent
There are many different models of 12 gauge shotguns for sale at online retailers like Amazon and GunBroker. One can also check online at eBay for 12 gauge shotguns which are for sale or trade.
Manufactured between 1886 and 1916. Retail value $50-$75 unless in like-new condition.
These shotguns came in 20, 28, 16, And 12 gauge calibers
You can't
The lower the gauge the heavier, sheet metal, wire & shotguns...
50-100
12 gauge shells.
Numerous companies in many countries have made single shot 12 gauge shotguns.