1. Don't.
2. If you think about doing it....don't.
If you do not know how to load your firearm, then you shouldn't be trying. Take it to a gunsmith, or contact the manufacturer of your "1100" and get the owner's manual. If the maker of the "1100" isn't in business anymore, contact a gunsmith.
The 1100 mag shoots 3in. shells, the 1100 standard shoots 2 3/4in. shells.
yes it will. the rating shotguns are chambered for is the maximum size shell you can shoot. i have a 1100 LT chambered for 3 inch and i shoot 2 3/4 inch shells out of it mostly.
You put shells in the magazine.
You need the services of a gunsmith
You need the services of a gunsmith
RCBS will.
No it does not the shells load from the top
Try different ammunition, verify the shotgun is put together properly.
3, including the one in the chamber.
yes
You need a gunsmith.
yes