I looked for one of these for years and could never find one so I built my own winchester bolt action 284.
I have long wanted to do just that! What are the specs on yours?
I started with a pre-64 model 70 action from a 30-06, sent it to a friend who works at Krieger barrels and he made the barrel that matched a pre-64 barrel contour including the rear sight boss. I did not cut the dovetail or drill for a front sight so it resembles a "gopher special". I have it in a really fancy walnut stock but also have an original pre-64 stock for it. When he cut the chamber I also had him lengthen it so I could seat the bullets out further than a standard .284. The .284 has been my favorite caliber for years and I always thought Winchester really shot themselves in the foot by not offering it in a bolt action rifle.