BTW....I wouldn't get to hung up on 300 Win vs Rum vs Wby. The Rum will out perform the Wby, and the Wby will outperform the Win, in the hands of shooters with equal capability. They all aren't very nice on barrels, but esp the RUM.
The ballistic differences between the three won't be manifested until after 1000 yds....the shooter/optics/quality reloaded ammo will be a larger factor in the performance differences between the 3 cartridges listed above.
And don't forget....Make sure to have fun at this!