I'm in the same situation but I want to hang a suppressor on the end.
Tikka's website has 16" and 20" factory threaded barrels to choose from - though I haven't found anyplace that seems to have the 16" version for sale.
Ideally I would find someone who has shot both lengths with suppressors on each to discuss the finer points but have not found him yet.
As for CZ - so far as I can tell they don't have a factory threaded .17 HMR in the 457 lineup. Otherwise I'd give them a look.
