They have a shotgun wedding
diameter
Note: The shotgun does not have "bullets" it has shells which are the casings and generally pellets inside the casing (of different gauge's); the number of pellets vary according to the gauge or size of the pellet. The smaller the pellet, the more there are of them.
About 1" past the muzzle.
A shotguns gauge is a measure related to the diameter of the smooth shotgun bore and the size of the shotshell designed for that bore. Gauge or diameter of the bore is determined by the diameter of 1 lead pellet times the number of pellets required to equal 1 pound. ex. 12 gauge is equal to the diameter of 1 of the 12 lead balls that equals 1 pound. ex. 20 gauge is equal to the diameter of 1 of 20 lead balls that equals 1 pound. ex. 3 gauge is equal to the diameter of 1 of the 3 lead balls that equals one pound. The larger number of gauge the smaller the bore.
An ice pellet with a diameter larger than 5 mm is called a hailstone. Hailstones are formed when updrafts in thunderstorms carry water droplets high into the atmosphere where they freeze. As more water freezes onto the hailstone, it continues to grow in size until it eventually falls to the ground.
A .025 has a larger diameter than the .020
It refers to the size of the shot pellet. It is the largest size of "birdshot", and each pellet is about .190" (4.83mm) in diameter. There are about 62 of these pellets to one ounce.
0.729 inches or 18.5 mm
Depends on what gauge the shotgun is.
.020
I believe you are referring to a .410 (pronounced four ten) shotgun. This is a shotgun chambered in .410 caliber, which is different from other shotguns that are measured in gauge.