For most of my shooting career I had no use for the 8mm in any caliber. Then I acquired a closet full of 8mm Milsurp mausers and do a lot of shooting with the 8x57 because of the availablility of cheap mil surp ammo for less than 10 cents a shot. I can spend time shooting instead of loading.
I blew off the 8mm Rem Mag when it was introduced in 1977 because of insufficient bullets. If Nosler does not make a Partition bullet for it, I'm not interested. Well now Nosler makes a 200 Grain and Swift makes A-frames in 200 and 220 grains, and Barnes makes x-bullets in 180, 200 and 220 grain weights. Hawk makes a large variety of .323 bullets and Hornady now makes a great 190 Spire Point and Nosler has added a 180 grain Ballistic tip.
I would seriously consider the new 8mm round, but principally as an elk load with 220 grain bullets at about 2900 fps. It would be fund to play with, especially in a medium length (57mm-62mm) action so that you could seat the bullets out with the bullet base flush with the case neck.
Several years ago a guy necked a 350 Rem Mag down to .323 and blew out the shoulder to 40 degrees. With a 24" barrel he got 2,800 fps with a 200 grain Nosler partition and 2,700 with a 220 Grain Hornady Spire point. that's about 150 fps slower than the new Win .325 WSM, but still not too shabby. All in all, I like the new .325 WSM and wish it well.