First, throw the tin away, use pure lead only for the Minié ball.
Second, wait until you have your new rifle musket in hand and slug the bore. Find a mould that will cast slightly over .002 under bore diameter then size appropriately. if your bore is exactly .58, you will want a Minié that is .578 in diameter.
And don't forget to drag out your scales, weigh each round to get consistency in weight for maximum accuracy.
Good for you using black powder rather than the ersatz (substitute) powders, it's much easier to clean than any of the others.
Second, wait until you have your new rifle musket in hand and slug the bore. Find a mould that will cast slightly over .002 under bore diameter then size appropriately. if your bore is exactly .58, you will want a Minié that is .578 in diameter.
And don't forget to drag out your scales, weigh each round to get consistency in weight for maximum accuracy.
Good for you using black powder rather than the ersatz (substitute) powders, it's much easier to clean than any of the others.