Whoever is the lucky chap (or lady) then they have impeccable tastes & certainly have acquired a bespoke rifle that can certainly hunt the globe - and with style!
They also were studious enough to realize what a brilliant cartridge this actually is & to finally chamber this round into such a rifle has turned this into a very highly desirable & collectible piece.
I certainly wish it was mine.....alas no!
Beautiful work to say least is very much an understatement Mr D!