Federal law says 18
yes
Yes
@ turn of the century, 50-100 USD
Gun shop, gun show.
The magazine holds two shells.
The largest EVER made was a 2 gauge. It holds a 2 pound metal ball, if I remember correctly. According the gauge index, a 2 gauge shotgun would hold two half pound balls since the diameter of the shotgun tube determines the gauge, the number of balls to equal a pound going down the barrel in this case would only be two to make a pound. Whereas in a 12 gauge, it takes twelve lead balls of the barrel size to make a pound. A two pound meal ball going down the tube would make for a .5 gauge.
12-70 is frequently used to indicate the gauge of the shotgun followed by the length of the chamber in millimeters. In the US, or non-metric measurements, that means a 12 gauge shotgun chambered for 2.75 inch (usually read two and three quarter inch) shells. Sometimes, you'll see 12-76 to designate a 12 gauge shotgun chambered for 3 inch shells.
It's difficult to answer the question because gauge and caliber are two different things, and different shotgun shells have different types and numbers of projectiles.
It is a Stevens shotgun, based on a Browning patent. Inexpensive.
What is the age and value of a 12 gauge Union Firearms Company Pump Shotgun with the Numbers 6804 2-7 with 2 Triggers?
Blue Book of Gun Values
You did not tell us what MAKE your shotgun is. The two 1895s that come to mind are a lever action Winchester RIFLE, and a Davenport shotgun, which had a prominent release lever right behind the hammer.