There's a bit of grey area concerning when an individual is "acting as a Cllr" or not. Somewhere the FOI allows for Cllrs having discussions between themselves as might be expected of a political party or groups of individuals and these are not subject to FOI. So they can form an opinion in "private", but where that information becomes "public" its under FOI. Similarly, reports as such like that are
formally considered by a Council in making a decision can usually be FOI'ed, even if there is some redaction to avoid personal or commercial details.
Have a look at the ICO website
http://www.qwerkity.com/air-rifle-target-duck-gallery-prod16063/and also your local Council's published policy guidance. They are normally a good explanation of the law and recent precedents, as they have to be given that most base such publications on a common standard document provided by government or one of their central bodies.
But on a practical level, it really depends what you want the information for. An informal discussion with an Officer or Cllr can be far more productive.
HTH
C