That doesn't seem to be the case according to Westjets rules. You have the rifle in a separate hard case, pay the $20 baggage fee, lock it, and it must be unloaded. However, you can have the ammo in the same hard rifle case if it's stored in a proper box and not in the magazine. That's how I read the rules anyway.
"Ammunition must be:
Securely packaged and packed separately from the firearm, however it is permitted to be transported within the same container.
Carried in sturdy baggage not weighing more than 5 kg (11 lb.) gross weight per person (excluding ammunition with explosive or incendiary projectiles)
Packaged in the manufacturer's original container or an equivalent sturdy, durable container that provides sufficient cartridge separation"
I have a small 27 inch hard case for my BLR. Haven't traveled with it yet though.