I suspect a bit of gold plating of the rules here.
My memory is that if someone considers you to be causing a problem that belief can be reported, It is not directly illegal to shoot nearer to a right of way than that. And that the distance is 50 feet from the centre of a public right of way.
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That's from my memory. If I'm wrong I'd like to know that.
[Edit:
Wot a bloody mess the above text is! In my defence I was tired!
The distance we are interested in is fifty feet from the shooting to the centre of a public ROW.
Greater than that distance, all else being sensible, no legal problem at all.
Less than that distance, if someone is offended by what you are doing, for example because of spooking a rider's horse, or other 'reason', once that belief is held by the offendee the law has been broken.
If no-one is offended the law has not been broken.
Again this is paraphrasing from my memory, but no-one has contradicted my crappy text.
/Edit]