The league Tommy is referring to is the Ontario Practical Multigun Shooting League, which is in its infancy currently with a bunch of pilot matches scheduled through the winter to work the kinks out in the rulebook. Focus will be pistol-rifle but shotgun stuff is in the works. All is subject to change but presently the basic division layout is as follows:
Operator: must wear body armour, helmet, and carry all match ammunition & equipment while competing. No PCC as primary. BUIS required if using an electronic sight.
Scout: No helmet & body armour required, but must carry all match ammunition & equipment while competing. BUIS required if using an electronic sight.
Veteran: Iron-sights only, guns must be of a design from 1958 or earlier. Must carry all match ammunition & equipment while competing.
Recruit: No requirement to carry match ammunition & equipment. No BUIS required.
Cadet: 22lr primary, otherwise same rules as Recruit.
That's just a basic summary, there's a bit more complexity such as some divisions being penalized for dropped mags, and so on. Scoring will be IPSC major/minor, with major being a 308 primary and 45 secondary (or equivelant) and minor being a 223 primary and 9mm secondary (or equivelant). Mismatched pairs are scored as minor. All PCCs are scored as minor.
Stay tuned, the rule book and other details are still being finalized. There are lots of good people (mostly familiar faces to those in the competitive shooting world) behind this and a number of CGN dealers have already stepped up to sponsor the league and prize table.
You can get on the facebook page to stay up to date at
https://www.facebook.com/ontariomultigun/
You can follow on instagram @ontariomultigun
Match dates and registration info will be posted on CGN and the above social media accounts.