Welcome Arson87 , Your plan sounds like a good one ,with a dozen Golf Balls or steelies from Fox and and a pound of powder you'll be a expert by the time the powder is gone .
The MAIN caution I will offer is that you never , EVER , pour powder into the mortar with the powder can any where near . Put it in a smaller container ,little vials or film canisters . This stuff s goes off so fast and can burn so bad that you must be VERY carefull . It does not 'fizzle' like loose smokless ,it goes whoof and it gone .
Besides being an expert you will have had more fun than should be allowed !
The thing about mortars is being able to see the ball land and recover . Have Fun I've bought Brookes guns and Dominicks gun .
They are both very good ,I've seen armorer77's on line ,they look very good as well .
Good luck ,this is the place !
Gary, my .02 worth