Truth be told the system could be improved enormously by dumping the section 1/2 split, when you really think about it, it's a nonsense. A firearms certificate to hold any legal firearm would make more sense. I don't even see the sense in slots, variations or getting land approved. You should have a gun limit according to storage and some limit based on common sense and security of property, but that's about it. Why an fac air rifle is treated as more dangerous than a shotgun by the licence requirements makes zero sense. Someone suitable to hold a shotgun should be just as suitable to hold a .223. Tie calibers in to compulsory courses if you must. Get your certificate then pass a course at a gun club/range/stalking school to hold a 12b/fac air/rimfire/centre fire etc.
Why is my judgement trusted about shooting a shotgun on land that's not pre approved but not if shooting fac. I appreciate a bullet can carry far further than shot, but a poor choice with a shotgun can have the same devastating consequences as with a rifle.
They should simplify and apply common sense, but also sanction hard those acting irresponsibly.