There should be a secondary lug on the barrel. Usually a steel block that fits in a recess in the stock. Bed it also. You want even contact amongst the two lugs.

Seconds on relieving the tang.

And very tight action screws!

There are lugs and then there are lugs: In progress photo of my 450 Rigby.

[Linked Image]

Survivor of the 13th Original Colony, I escaped on December 17, 1968.