Could be any of them as the "00" does not denote caliber, but the size of the shot contained in the shell.
No
none
yes
.410
gun powder
Any gun store sells it. Commonly shotgun shells #8 or #9 shot.
Shotguns fire shot shells. Handguns can fire specially made shotshells.
Many fine 20 gauge shells are made.
What is th value of a Ranger double shot gun. Serial c4537.It is a 16g
Have it checked out by a gunsmith before you try it.
Double barreled shotguns are manufactured in several countries.
depends...mine holds three when shooting 2 3/4" shells