I wouldn't get either in a BAR myself. When I use my 300win, or RUM, or WSM, its always open country, and I usually hike alot, so a heavy BAR doesn't suit me. I like BAR's for thick woods, and whitetails with whitetail calibers like 308win.

But reloading wise, I can get some serious performance out of the win mag compared to the WSM. I can get subMOA out of mine with 3100fps with 180gr bullet. I can never do that with a WSM. But I have had WSM that were very accurate.