Bravo!
As a horse archer with a skill level of 250+, I can testify that is a dooozy of a difficult shot. Well done, and with a hunter bow no less.
I've never gone in much for the long distance shots myself so I don't recall any that high or even close to that. Maybe a few 6.8 shots, in that range.
However, I think that what I specialize in - the quick ride-by shot while galloping full-blast - is also worthwhile and difficult to master.