I have several rifles that just don't get work any more. Five 300 wby's from years back and now I either shoot the 300 wsm
or the 300 ultramag. The wby just gets lost in the shuffle. Same with my 7mm rem mags and 7mm wby mags. I either shoot one of my 7mm stw's or 280 AI, 7mm jrs or 7mm gibbs. The 7mm rem mag just has no place anymore. The smaller ones just about equal it and the stw blows it away. I could go on but you get the idea as new things come out you got to have the old ones fade away because they are just to close to either but one smaller or bigger is better and the in betweeners just get no work. Another would be my two 338-300 ultramags. I spent a year developing the thing back in 98-99 and then the 338 rum comes out in 2001. Now I either shoot my 338 RUM or 340 wby and if I want a big long range gun one of my 338-378's. I need to have a sale on all my in betweeners I don't use anymore. They are still great rifles and kill stuff just the same but just don't fit into my arsenal anymore.
Since I got that tikka 300 wsm I liked it so much I got the tikka in 300 and 338 winny's. The 300 winny gives me a few fps over the wsm and the 338 winny puts me in a big time light weight elk/bear gun. So now where does my 300 wsm fit. If I went broke and had to sale them all but a couple I would tear my hear out deciding. The gun manufacturers stay rich because there is always something out there that fills that niche just a bit better.
If I was nutjob and knowing what I do after having everything and understanding he has a 300 ultra I would do the lightweight 300 wsm. Then he has all bases covered for just about anything that walks and from backpacking to a long range heavy performer.