Don't know about Connaught or other DND ranges in ON. A few areas of concern - how DND feels about folks gathering and using the facilities and what the policies of the ON Gov't are with respect to gatherings and travel. And for shooters to the east, there could be border crossing restrictions. Who knows? Wait and see.
As far as matches being held by OSA at MilCun, the schedule is on hold, and will not be revised until it is known what is going to be allowed. (www, osacanada.ca).
Matches were scheduled, detailed courses of fire are posted so that shooters can know exactly what to expect, but right now everything is in limbo. OSA/MilCun, being private, might be able to operate even if DND isn't opening its ranges for competitions.
A while back I made up a rather low cost bolt rifle suitable for service type shooting. Salvaged R700 action (belt sanded the wrench marks off the receiver left by someone's attempt to remove the barrel), take-off Savage sporting weight 1-9 .223 barrel adapted to the 700 action, MDT LSS chassis AR butt and grip, low powered variable scope, 10 rd. magazines. Put a brake on to eliminate flip. With 69 SMKs or Hornady 68s, it will hold 1 1/2 moa, which is fine.
There are still n-r semi autos which would work well in competition. I don't know that I would buy invest in one until there is some clarity about what Justin and Bill are going to allow.