Hi Brian, your using a focal length of 600mm before any camera crop factor... don't skimp on support. Manfrotto 055 is the bare minimum for a legset, even more so if you are using a big f2.8 300mm lens. If it is a f2.8, then I'd suggest a fluid type head along the lines of the Manfrotto 501 pro.
The quality of modern Fluid and gimbal type heads have made ball heads almost redundant today for the bird/wildlife photographer with large lenses.
cheers,
Andy
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