I am deducing shotgun rifles don't count?
No. This is part of my collecting evidence that police have adopted intermediate-calibre, (semi)automatic rifles since the 90s. Kind of interested in what you define as a "shotgun rifle" though?
On my quest to try and explain this to me self-explanatory definition I realised that you probably define rifle by the rifling of a barrel, and not like I do, which is by being bigger than a pistol and preferably used with two arms. Am I right?
I can see where you're coming from. Definitions always have to be taken in context. Shotguns can be similar to rifles since they're also fired from the shoulder and can have fully or partly rifled barrels or chokes. The distinction is that they fire shot or slugs, the latter of which are like rifle rounds but usually more massive.
To get even more specific, the types of rifles I'm looking at have a high capacity (20-30 rounds) compared to the shotguns and pistols police have, and semi-automatic fire capability which typically non special role (HRT/SRT/SWAT) police shotguns don't have. Very different from the typical shotgun you would find in the hands of police. This isn't about whether the gun has rifling or not, but the type and purpose of the rounds being fired as well as the capacity and rate of fire of the weapon, which here is the key distinction between rifle and shotgun.
E: Okay done editing up that response.