Clem its pretty simply really. I like to use JB Weld if the inletting on the rifle is tight. If not, use something that can be stained or colored brown to get a closer match to the wood.
Doing that traditions now and I did a little drawing of where I do everything on a rifle like this.
Any material by the wedge key is something that depends on how the barrel fits into the stock without the pin in place. If its moves around a little bit, It gets bedded.
Basically the tang ( screw holes as well If they just go into wood VS through the trigger plate) and something 1 to 2 inches behind the barrel where the tang meets up. But again, it all depends on how that barrel fits in the stock.