I think any issues that may arise from someone going shooting at this time, will boil down to which police officer stops them.
For instance, the current rules state that I can check my livestock that are off site, once a day, whilst combining it with my daily exercise, now who thought that up? I've got to be there twice a day incase any give birth, now if I get pulled, techincally I'm in the wrong, but will common sense prevail? Who knows.
Will I go shooting at the moment? Probably not, unless I'm asked to, then I might.
For risk of getting or giving covid 19, I'd have far less chance whilst out shooting than I did going to Morrisons on sunday.