My apologies for noting the obvious, but "nice bores" in a vintage gun usually means honing. If the wall thickness is inadequate, your options are limited.
Please share the end-of-chamber, 9", mid-barrel, and MWT (and location thereof).

Bertram Edmonston is another option
https://www.facebook.com/BertramCustom/photos/a.1406522922897924/2406368079580065/?type=3