Bear Creek Ballistics does custom .450 Bushmasters bolt actions.  I think with the straight wall rounds, people are buying them mostly as a tool.  It's got a particular niche for its use, but other than that, there's not a lot of reasons to buy one.  I've had a Weatherby Vanguard that was pretty accurate, and I currently have a 2016 production demo Winchester XPR compact that is exceptionally accurate with every factory hunting load that I've tried. Everything under 1 1/4" or less and more than enough 1/2"-3/4" groups three shot groups to make me wonder what I did to screw up and shoot a 1 inch group.  LOL.  It's even got a superb 3.5lb trigger in it, breaks like a glass rod.  It's a joy to shoot, with low recoil.  AND YET..... I'm getting ready to sell it because the ONLY reason I bought both of the rifles is because of maybe getting to hunt some family land (wife's side) in OH, that has yet to come to fruition three year running because they don't know what they want to do with the hunters who currently lease it.  Whole other story.  
.350 Legend is a sailboat at 200 yds with any kind of wind.  If I don't NEED it, then I don't WANT it. 
There's other low recoil rounds with an extra couple hundred yards of reach (easily) with no more recoil or even less recoil.  Hello .223, the ARC's, the Grendel.