RE: I want to build a 358-STA tell me what I need to do?
Hi Wolf killer,
I think another action that can be had simply in action form is the Magnum CZ. It is certainly big enough to contain the cartridge and you may not need to alter the magazine either, (additionally the capacity should probably be about four + one or maybe even five + one. Other than the action the rest of the job could be completed as Vapo stated!
Additionally you can probably have it for less than the Remington action.
Or if you are willing to consider a single shot you might be able to have the Ruger No. 1 built in .358 STA for less than starting with a bolt!
(As an after thought....there are a number of custom/semi-custom manufacturers that will build and chamber in any SAAMI standard cartridge!
Good luck!