Well I was actually talking to a gentleman in the local gun store here and that's what he was telling me. He said that the 325WSM is actually a 8mm which is .323 but the americans who developed the cartridge didn't want to market 8mm because it isn't all that succesfull in the states because that's what the Germans used to kill the US soldiers during the war.
And yes I plan on using this gun to Hunt moose but I'd also like to try Caribou and Elk hunting eventually with it.
The 8mm bore has never sold well in the US, but that is true of anything labelled in metric, besides the 7mm Rem Mag. I don't think the previous usage of the metric bore sizes in military rifles is as big of a factor as is the European origin with a "funny" way of designating the caliber. The US is still sticking to inches and feet, while the rest of the world has gone metric.
I was considering this myself when I was looking for more thump than a .30-06 for hunting moose and elk, particularly where big bears were also present (which means most of BC). I originally wanted a .338 Win Mag, but looked at the .325 WSM as well. From all that I was able to find, the .325 kicked slightly less and was shorter, otherwise, the .338 is superior. The .338 has a better bullet selection, including heavier weights, more muzzle and downrange energy, and is available in more factory loads that are more available due to its longer history. The .325 is also loaded pretty hot from the factory, and is reputed to be difficult to even match factory velocities, let alone exceed them, which is true of the short mag series in general. The .338 on the other hand is easy to match factory velocities, and in some cases exceed them by up to 150 fps, with safe pressures.
The reason that has been kicked about as to why it was made as an 8mm, rather than a .338 WSM, is that the factory was not able to get close enough to .338 Win mag velocities with safe pressures, and they felt this would hurt the selling potential of the round.
This is not to say the .325 is not a good chambering, and should suit your intended usage well.