only if your choke is improved cylinder or modified, full chokes are a no,no. the barrel will bulge or burst!
NO!!
yes
Can you....I think you mean Can you 'SAFELY' leave shotgun shells in a hot car? The short answer is yes, but it will degrade the quality of the ammo.
The longest shotgun shell that you can safely use in your 12 gauge shotgun are 3 inchers.
Yes, shorter shells are no problem.
Slugs. You CAN shoot lead bird shot in a rifled barrel but it will not give you good or consistant patterns.
Yes. Lead shot may be safely fired from a shotgun that is made for steel shot. Problems arise when you fire steel shot from an older shotgun that is made for lead shot only- the barrel is softer metal, and make be scratched by the steel shot.
None. While there are firearms made to shoot .45 Colt AND .410 shotshells, they are designed and made to do that. A regular .410 shotgun is NOT made to do that safely.
Your ithaca flues was made in 1909,so you were close.i would have a competent gunsmith look over your nice ithaca shotgun.he would be able to tell you if your shotgun can first be shot safely and second if the steel used on the shotgun barrels and reciever were made for smokeless or blackpowder shotgun shells.
None safely. It is a shotgun. Rifles operate a MUCH higher pressure. What you descibe will very likely kill you when the gun explodes. REALLY bad idea.
Rifled slugs may be safely fired thru MOST shotgun barrels, The makers of some variable chokes recommend that slugs NOT be fired thru them, and turkey guns that use the Extra Full choke aer not usually recommended for slug shooting.
safely