The featherweight was chambered for the 358 Win with a .358 bore and the 9.3 is .366. I once rebored and rechambered a featherweight barrel to 338 Win. Mag. I now do not feel comfortable with the rebore. The fly in the ointment is the rear sight dovetail cut. The barrel gets real thin at this point. I once met the famous barrel maker Paul Marquart. He had only part of one hand, the results of a barrel of his blowing up.
