No!
No, just keep it safe.
Take it to a gunsmith for inspection
We can't tell- you are not holding the gun close enough to the computer. You need to take it to a gunsmith for an answer.
IF ANY SHOT GUN HAS A MOD CHOKE OR IMPROVED ITS OK, ONLY FULL CHOKE WILL NOT BE SAFE, BULGING IN THE BARREL MAY OCCUR.
Impossible to answer without having the gun in hand. Iver Johnson made good, sound, utility grade firearms for many years. These were the guns of the mechanic, farmer, small shopkeeper- well made and safe to use with the correct ammo. However, we cannot see YOUR gun, and have no way to judge the condition. You should ask a competent gunsmith to examine your gun, and I WOULD avoid using steel shot in the gun- that will cause accelerated wear on the chokes unless the gun was made for steel shot- which THOSE were not.
No
Not unless the maker says it is safe to do so.
To hear the gun shot at the start of the race
Yes. Not highly likely, but people have died from being shot with air and gas guns. These were cases of the classic "unlucky shot". First rule of safe gun handling- never point a gun at anything you do not intend to destroy. That includes pellet guns.
Yes.
There is no patron saint of gun shot injuries.
My gun.