I know a couple of guys that bought .325 WSM's when they were looking for "something bigger than a .270 or .30-'06, but not as big as a .375." They are happy with them, and routinely kill stuff. I'm not sure any of them know they bought an 8mm, nor do I suspect they much care. I also doubt if they've heard of a .350 Rem Mag. The .325 WSM came along at just the right time to meet their needs, and there it is.
Practically speaking, there is a lot of overlap out there...in cartridges, trucks, restaurants...it's great to be American
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Dennis