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You might also look at the 50-200 F2.8. It is optically much better and focuses very fast. I know you want the longer zoom but this lens is so good and so fast that you may find you get a better image with a moving subject. I'd use the original Panasonic adapter on it, the current Oly adapter is so plastic.
Amazon price is down to $524 on panny 100-300mm so I ordered it last night. For the time being I want m4/3 size because i place all gear in a small tank bag and go picture hunting from my motorcycle. Might look for a larger sized 300mm lens in the future for really dedicated shots.