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.
Have it checked out by a gunsmith before you try it.
Gun shot wounds that do not damage a vital organ, and receive medical treatment are not usually fatal.
depends...mine holds three when shooting 2 3/4" shells
Could be any of them as the "00" does not denote caliber, but the size of the shot contained in the shell.
Do not attempt to do this. You may cause damage or injury.