DSC_9970-1 by William Friggle, on Flickr
DSC_0071-1 by William Friggle, on Flickr
DSC_0021-1 by William Friggle, on Flickr
DSC_8272_edited_2 by William Friggle, on FlickrMy 70-300 is pretty bad at 300, and its major utility is the 100-200 range.
Avoid 70-300 in all its iterations. The IQ at 300 is just not upto it. Get a shorter zoom, max 200, and then save for the 300 prime.