If someone gave me a 325 WSM I'd load it up and use it. I can't think of a single reason to choose it over a 300 WSM though. The actual difference in bullet diameter is .007". That may not be splitting hairs, but it is about the same difference as the thickness of 2 human hairs.
According to
www.nosler.com the best loads with both 325WSM and 300WSM and 200 gr Accubonds gives a 20 fps advantage to the 325. 2944 fps vs 2964 fps. That's about 50 ft lbs more energy at the muzzle. But when you look at BC's of .588 for the 300 vs only .450 for the 325, the 300WSM passes the 325WSM within the first 100 yards and is well ahead at 400 with 2" less bullet drop.
Same bullet weights within 20 fps and powder charges within 1-2 grains is going to give darn near equal recoil. I've never loaded anything heavier than 180's in my 300 WSM, but recoil is quite mild. Just barely more than 30-06 loads with 180's.
Both will kill deer or elk, the 325 just offers no advantages, and some disadvantages. But if someone gave me one, why not use it.
