Barreling a Flat Spring Highwall which, after I get it fitted, goes off  for Color Case Hardening.  Going to be an Octagon Barrel so how and what do I allow.  Fit it Loose or Tight, I can think of reasons why each would be preferred.  By the way the Action right now is Blued but has the Toughest Case I've run across.  Any suggestions?  Thanks, David

HiWall action to Turnbull for CCH. Barrel fit as before...no problem.
Richard

You need to be careful of the temperatures you heat to and soak at.  If that’s done right, very little warpage occurs, if any.  Some thought given to keeping the open sections properly open helps as well.

One of the guys at the CCH Class at Lassen did a double-barrel shotgun frame, the kind with the long skinny tang, the exquisitely-fitted sideplates, and the mortise-and-tenon trigger plate.  He picked the parts out of the quench and everything fit together just like they did before.

I’d make a threaded piece to turn easily by hand into the barrel socket and a roughed-out piece of metal to a sliding fit in the block mortise to keep it open properly through the process. I’d use bits of rod or wire to hold the Highwall lower tang in place on the receiver.  The  bent sheet metal and wire wrap we used to keep as much of the charcoal as close to the metal as possible for as long as possible during the quench held it all together.

I did two Ballard and two Stevens 44 frames and the barrels screwed in normally afterwards.  A pro shop ought to have no trouble getting the same results.