Looks like an STW. A 7mm Weatherby case is no longer than a 7 Rem Mag so I doubt it's that.
The action is long enough for the STW and would require a change to the mag box, follower,bolt stop and ejector to work properly.....but anyone who rechambers and does not mark the barrel might not have had the brains to make these changes.....to many people rifle function is a vague and obscure concept,but who knows what was done here. I have my doubts about the whole Boss thing anyway. Trash the tube.
Looks like a good donor but that's about it. The action guts can be changed to whatever with the right parts.
