Most of the ORA action is at Borden which is actually the closest military range to Aurora I think.
There is opportunity to shoot Service CQB from 35 to 10 yards or stretch your range to 1000 yards for TR, F-class or what ever you have to shoot (Try a P14 Enfield with original iron sights like I did last year)
There are several competitions in each discipline each year and opportunities for practice, usually at longer ranges. Your membership fee entitles you to member rates for competitions and clinics. Practices are free (except Precision practices...which are really clinics so there a cost here).
The ORA is a competition oriented organization so most events and practices are oriented toward this. However you can bring out just about any rifle for any practice, as long as it will toss a bullet the distance you are shooting have fun (I have a buddy who just loves to play with his 6.5x55 Swede at 1000 yards or other vintage rifles.....when he isn't playing with one of his heavy barreled bolt actions)
One more for fun "discipline" are the Vintage / Fun shoots. These are suitable for just about any rifle and you get to shoot and static, snap (short exposure) and moving targets and 100, 200 and 300 yards. This was actually how I first got exposed to the ORA a couple of years ago and it was a great way to get introduced in a not very tense competitive environment.
What are your shooting interests? Do you want to shoot competitively? Do you want to try your hand and longer ranges with your hunting rifles? Give us some idea of what you are thinking you want to to and we can better help you decided if the ORA will give you what you want. You should also try to attend once of the Introductory Days which will give you an overview of the different disciplines practices by the ORA. You may find something you like that you did not know exists, or at the very least you will know what the heck folks are talking about when they discuss TR/F-class/Precision/Service Rifle/CQB/Vintage etc.