Hey bud! Alberta is cool except for the minimum hunting caliber restrictions. Was just up there for Stampede.
Nanooks are awesome except for the trigger they force you to use.
.223s are awesome for training and killing stuff but you live in Alberta.
Advice:
Build a 24" 6.5CM or .260 if you are a reloader.
Build a 20" 6.5CM if you shoot factory ammo.
Rationale:
6.5 is the most prolifically produced rifle ammunition in the .470 "standard" bolt face.
It recoils mildly, and is fun and relatively inexpensive to shoot.
It's great for introducing new shooters to the sport after they've shot your .223 gas gun.
The Nanook, with its integral everything, is a great pick for an NRL Hunter action. You'll be able to find pre-fits easily and change them stress-free.
In NRL Hunter, 6.5mm is the minimum caliber for which power factor need not be met if using sealed box ammo - this lets you use any barrel length.
In NRL Hunter, 6.5cm or .260 are the minimum rational calibers with which to make 380,000 power factor (weight times speed) if you are reloading at around 24" barrel length.
NRL hunter will improve your skills for killing animals, and is a hoot.
This same rifle will make a lovely killer out to about 500 yards with simply an ammo change.
Let us know what you choose!
-J