I think if you need a long-range lens, it's best NOT to rely upon a converter on an already slow lens like the 70-300VR-G Nikkor. I have that lens, and with its rather slow maximum aperture, well...a converter is going to give some dismally slow effective f/stops. I honestly think you'd probably rather have a SIgma 50-500 or 150-500 for "wildlife" type shooting. The 70-300 VR is smallish, and easy to carry around in casual type situations, whereas the Sigma 150-500 is a much bigger piece of pipe...it's more of an "effort" to lug something like that. But then again, the Sigma is DESIGNED as a long-distance zoom lens....not something jerry-rigged to become something...
This entire "affordable big telephoto" area really is a no-win situation in some respects...there really is nothing "Top Level" optically until the $4,500 class with the Sigma 500mm f/4.5, or used Nikon 500 f/4-P manual focus lenses (which adapt well to Canon's via adapter BTW)...with the effective f/stops of like f/6.3 at 500mm, even the $1000 zooms are kind of slow for winter-time shooting except in the very brightest light, or at the seashore/lakeshore/snowfields, where there is ample light.
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