Ontario is short range shooting. That really opens up the choices. Deer don't need much killing. A 30-30 does the job easly. Bear only need a 308 type power.
Hitting what you aim at is the key. Unless you are an expereinced shooter, flinching can destroy your accuracy and fun, so "a bit too much gun" is not a goodthing.
I own many different calibers and load for all of them. The rifles that have impressed me the most are the Savage bolt actions and the remington pumps.
The claibers I like the most are 260 rem, 280 Rem, 7-08, 308, 30-06, 356 Win, 35 Whelen and 358 Win.
A 260 with a 140 grain bullet will take both deer and bear. It won't destroy a lot of meat.
I am hard pressed to pick a favorite rifle/caliner, but I really like my 308 and 35 Whelen Rem pump and my 356 Win M94AE.