For the price of pistol lead round ball, I would buy them and not cast. Casting is not the healthiest thing to do often and cheap lead is harder to find. Also if you're in T.O. am sure your neighbours will not want you lead fumes blowing into there yard lol.
Things I've learned
-Using real Black powder FFFg
-Use Remington #10 caps
-Buy a revolver capper "not a rifle type"
-Buy aftermarket nipples
-Grease wads are way easier
-Buy/make a revolver loading stand "must have!"
-Be prepare to fix QC issue's like burrs, timing, short arbor, wedge issues
-Ballistol is your new CLP
-Black Powder shooting is a hell of a good time!