The project you describe will be very economical and I can supply Shilen match barrels that are a drop in fit. The Stevens work very well out of the box and are not saddled with the handicapps found in other solid front locking actions.
There is little reason that a Shilen match barrel in a chambering you want can't shoot as good as more expensive custom rigs. I compete with mine and the many that I have built all seem to work just fine.
None of my actions, including the feature on 6mmBR, has had any work done to true the actions. Simply not needed. I do adjust the bolt timing to make the bolt lift easier but that's it.
The barrel install is actually very straightforward to do and your 'smith friend will be able to get it done in a few minutes. I am not supposed to quote pricing in the general forum so just send me a PM. I also have an EE post that will be near the top for all the info you could want.
Unless you have very specific desires for the 338WM, there might be more options that could work better. Let me know what your end use will be and I can help with suggestions on barrel and chambering specs.
Dan and keegs, thanks for the kind words/referal.
Jerry
PS, sounds like a 300WM is a min and the 338 is nice for bear BUT a small case 338 is not a LR friend. You will get better LR performance with the 300 then you will with the 338WM. As for short range game stopper, neither is particularly big. I think 300WM ammo is more readily available if going overseas too.
Since this is mostly hunting, consider the SAVAGE with new center feed mag and accutrigger. The trigger is superb and will do all that the SSS will do and be safer ( 2 to 2.5lbs pull is a no brainer).
The Dmag is superb and run smooth. To add this feature, some are spending upwards of $800 for parts and labour to install in Rems
The Stevens trigger will go to around 3lbs pull which will be very crisp and no overtravel. Not sure if you want lighter in a hunting rig. Comes with a blind mag which is fine but I like D mags.