That depends on the size of the shot in the 3 inch shotgun shell,and the weight of the shot.
The number of pellets contained in the shell will depend on the size of the shot.
pellets, powder
The arrangement of star pellets inside the shell.
.410 shotgun shell either 3inch or 2 and one half inch
an egg
Steel or lead pellets... you know, the stuff they already come loaded with.
No, not advisable.
Remove the lead pellets from a shotgun shell. Reload it with rice and then shoot the little beast.
Depends on the guage and length of the shell, and the size of shot used. It may be as few as 3, (.410 Buckshot) or as many as several hundred (10 g birdshot).
8 hours
Depends entirely on the gauge and size of shell. Can vary from 9-30
OO Buck contains nine .32 sized lead balls.