As the subject says: Anybody know of a company that makes T/C Encore barrels chambered in 9.3x62? Preferably stainless steel.

I haven't seen any so far, I've checked MGM (only 9.3x74R listed). Bullberry doesn't list any 9.3 at all.

David White (aka ASSASSIN) has done a bunch of work with the 9.3x74R, but not sure about the 62mm round. My guess is he'd glad to help you out, although he might try to encourage you to go with a rimmed cartridge, as they are preferred in the single-shot actions.