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Cheapest option is a take off tikka barrel. Lots of guys doing semi customs off New tikkas so no shortage of brand new Tikka barrels. Have your smith spin it on and go. Better option is a new barrel. Benchmark are amazing but so are most other quality barrel makers.
I don't see a s.s. option on Benchmarks site
If it’s not safe to shoot “beyond this season”, it’s not safe to shoot now. I’d get a second opinion. BLACK HAMMER ARMSType 07 Class 2 NFA Dealerhttp://www.blackhammerarms.comhttps://www.Silencershop.com/blackhammerarmshttp://www.facebook.com/blackhammerarmshttps://www.instagram.com/blackhammerarmsGLOCK Certified Armourer
I'm a little biased cause i live by benckmark and my niece works there.(ask for Kourtney she usually answers the phone)They make great products and really care about what they do.Your close, drive up and meet them in person.Tell them uncle beaver sent you and you might get a discount Ask them about muzzle breaks also.
To bad you aren't looking for a new Tikka 300 WSM take off barrel because I could probably help you out with one of those. If you go the custom barrel route any of the top tier barrel companies like Benchmark, Krieger, Hart, Brux, and Bartlein just to name a few will serve you well. If you're relatively local to Benchmark I am always a fan of using someone I can actually drop my stuff off to instead of mailing it to them.