They have some for sale on gunbroker.com - use 25 stevens for your search in the ammo section. You can shoot both the longs and/or the shorts in your rifle. Buy the newest ones if you want to shoot them. I've shot many of the "Canuck" they are fairly recent (1960's).
Times are tough - Keep your powder dry
"These are the times that try men's souls." - Thomas Paine