I had a model 43 with the same problem years ago. Setting the barrel back and rechambering with a .218 Bee reamer cured it with no stock work needed.
I would not be afraid to try the JB Weld method. Your basically just "putting new asphalt in the potholes"- no harm in trying.
I would not be afraid to try the JB Weld method. Your basically just "putting new asphalt in the potholes"- no harm in trying.