Correct, not all smiths have lathes that can cut metric threads and getting the barrels off a factory made Howa is legendary. I think most folks that have messed with them before don't even try until they put a relief cut in the barrel just ahead of the receiver.The only downsides are the metric threading and a reputation for difficulty getting the barrel off!
Who is your riflesmith? It can be difficult to find smiths that will do the metric threads, even these days. I have a Howa Mini built into a custom single shot 22 Spitfire, put a JARD trigger in mine which is sweet. Getting to be quite a bit of aftermarket stuff for the Howas.I like them very much. (Vanguard action = Howa). I like the three-position safety, excellent extractor, and the sturdy construction.
My rifle smith likes them too and is an advocate of using Howa actions as a baseline for custom builds.
Will PM you with info.Who is your riflesmith? It can be difficult to find smiths that will do the metric threads, even these days. I have a Howa Mini built into a custom single shot 22 Spitfire, put a JARD trigger in mine which is sweet. Getting to be quite a bit of aftermarket stuff for the Howas.