Google 'Firearms Users Visiting Canada'. This is an RCMP site listing what you can and can not bring, in respect to firearms. There is an application you need to acquire & fill out before you come. Do not sign it until you can be witnessed by a customs officer. There is a $25 CDN fee for the permit you will be issued. It is good for 6 months, but only for the firearms you list.
Your muzzle loader is not a restricted weapon so you can bring it with you. DO NOT bring hand guns, of any kind with you. TRUST ME on hand guns, you don't want or need the hassle. This is CANADA.
The site says you can bring a reasonable amount of ammunition with you, but I didn't specifically see any mention of black powder substitutes. If you are flying, you CAN NOT bring powder with you. It would be a good idea to have your outfitter have the proper powder on hand for when you get here.
Also, pay attention to the requirements for fire arm security-trigger locks etc.
If you have questions, there are contacts listed you can ask. Canada is a great place to visit, but where fire arms are involved, educate yourself to avoid unnecessary difficulties.
Paul

Have a great hunt, and we will need to see pictures.