No
Do not see a 543 in any of my references. Sorry-Sportsman is associated with the Remington centerfire rifles in Model 76, 760, and model 78.
1930-1947
apparently $350
apparently $350
75-400 USD
A model 742 magazine
There is no model number 3006 or 243 in the Woodmaster line. Check Remington's webiste under the Sportsman's Library.
Take it to a gunsmith
Take it to a professional
50-200 or so
According to the Remington website the 78s were produced between 1984 and 1988 Deemoss
Numrich gun parts. Look under Remington SPT 58.