US Code, Title 18 states that it is unlawful for ANY convicted felon to own or possess firearms. It makes no difference what state you happen to reside in, since it is a federal law, and therefore, no way to get firearms rights restored in South Dakota.
Firearms laws in South Dakota are in accordance with the federal laws, without much added to them.
You need to ask a lawyer who is familiar with firearms law.
Not unless you've petitioned the state to have your firearms rights restored. BTW; Expungement only removes your record from the public portion of your records, law enforecement, the courts, and government agencies still have access to it.
South Dakota
The US state of South Dakota is south of the US state of North Dakota.
The US state of North Dakota is north of South Dakota.
Yankton, South Dakota is on the border of South Dakota and Nebraska as are North Siuox City and Dakota Dunes, South Dakota. Big Stone City, South Dakota is on the border of South Dakota and Minnesota. Lemmon, South Dakota is located on the border of South Dakota and North Dakota.
South Dakota did not have any 'colonial days' because South Dakota was not a colony. South Dakota was part of the Dakota Territory, so South Dakota had 'territorial days'.
North Dakota is up by the border of Canada, Wyoming is just next to South Dakota.
South Dakota's origin means how the state of South Dakota got its start. South Dakota was a part of the Dakota Territory. South Dakota became a US state in 1889.
North Dakota is north of South Dakota.
The state of South Dakota is south of North Dakota.