[Rifleman55]

If I were you I would use this as an excuse to buy a new bbl (particularly if you need to justify the expense to the better half). "Gosh hon, I need to buy this new bbl". Then go out and get a nice new match grade tube and tighten those groups up some more. The old tube? Have it recrowned and keep it as a spare.

Just my two cents.
Grumpy

You might get a brass round head screw and some valve grinding compound and your electric drill and repair the crown your self.
It is worth a try