Yes
yes
Needs to be checked by a gunsmith
Depends on what it is choked.
Can you Yes, should you NO. a full choke should not be used to shoot slugs.
Depends on what it is choked.
yes
You need to contact Remington for a correct answer.
to test it take apart a 410 slug and see if it fits through
yes
Savage. Model 51 & 951.
Check your owner's manual or call the maker.