RE: .325 WSM
I'm not sure about the .325wsm being around down the road...the .300 wsm definitely will.
Ruger has the .300 RCM and .338 RCM, not sure how the .338RCM compares to the .325WSM but I did read an article saying they tried to make a .338WSM and couldn't get it to work right to their standards etc..., ruger apparently has...
Also there's the .338 federal, based on the .308 etc..
I don't really see the .338RCM being a hit, a .338-375 Ruger I could though, but that doesn't exist yet and you sound like you're looking for a short magnum.
I'd say consider the .338 Federal vs. .325WSM, maybe youre research will show one to be more likely to survive...most of the .308 cousins seem to all do well, ie .243, 7mm-08, .260 seems just ok though.
Also the .325 is an 8mm, which doesn't seem to have had much success in this country, also you're looking at a .323 bullet vs. a .308 bullet dia. so it may make more sense to just get a .300 WSM in that case and load it heavy if that's what you're looking for instead.
btw the .338 win mag isn't going anywhere....and that is a tad shorter than a .300 win mag, the kick isn't all that bad, may just consider a .338 win mag.
If you're looking for something lightweight and less kicking, I think .338 federal is the way to go, a .325wsm, or .338win mag in something light is going to kick.
So either get a .300WSM, or get a heavier gun in .338win mag, or just deal with more kick, or consider a .338 federal in the setup youre looking for