The .300 WM is a great hunting round...capable of taking anything in North America (and a lot of stuff in Africa)... ***I would prefer something a bit bigger for the brown bears and some African species have a .375 H&H minimum***

Find a bullet style and weight your rifle likes (such as a 180 grain Nosler Partition) and go hunting...antelope, deer (esp. the Coues deer), elk, sheep, etc. Probably a bit of overkill on prairie dogs...though I have seen it done...

The .300 is a very versatile cartridge...