As far as the 200gn factory loads in 300WM equaling the 325WSM, the jury is still out on the .325WSM's capabilities. The real potential of any cartridge will in the end be found by reloading and because of the newness of this round we won't see any real results very soon. But because the 8mm does have .38mm more diameter it means that an 8mm projectile(of the same weight as a .30 cal projectile) has less length and therefore less friction in the barrel thereby allowing the 8mm projectile to have a greater MV, theoretically of course. There are a great many other factors but it does contribute when exploring maximum loads.
But that wasn't really my point. The .325WSM is an alternative. How many people, I ask you, own a 30-30, a .308, a 30-06 and a .300WM? Perhaps not a hundreds of thousands but quite a few I'd imagine. And there is another significantly larger group who own at least 3 of these calibres or even just 2. And I haven't mentioned the other numerous .30 cals available to used by shooters. What does that say in the scheme of things? That people like alternatives. It also says that Americans like .30 cal rifles. And there's nothing wrong with that either. It took them through 2 world wars and numerous other conflicts. But I think if you're in the market for something interesting then the .325 is certainly a goer.
As far a 8mm bullet development goes, Barnes this year are introducing a 180gn TSX although admittedly Barnes approach has always been to have a lighter bullet and therefore a better MV. Have a look at
http://www.woodleighbullets.com.au/Bullets.html . Woodleigh of Australia have a 8mm RNSN Weldcore bonded core bullet that was designed, I imagine, for 8mm Rem Mag since they built their reputation on bigbore big game bullets. It's 250gn........heavy enough for ya? :-)
Oh, Lagavulin, if you have to get rid of your Supergrade don't be afraid to send it Down Under where it'll lovingly be looked after :grin: