If memory serves, the only Savage semi-auto shotguns would be the Browning type long-recoil system guns.
They all had model numbers in the 700 range (720, 740, 750,775,etc). I believe the 720 and the 755 were both made in 16 gauge. These are both "square back" or "humpback" style receivers just like the Rem Model 11 and Browning Auto-5. In fact functionally speaking the Savage, Rem, and Brownings are all the same gun (with minor differences). Generally speaking parts will not interchange, though some can probably be fitted or altered to work.
Savage also made a model 775 that had a streamlined receiver. Like the other models it used the long-recoil system. Don't know if it was chambered in 16 ga.
If you're looking for info on disassembly/reassembly or how to set the friction rings for different loads then anything for the Rem 11 or Brng A-5 should suffice.