Black powder burns best in a compressed load, sometimes compressed a LOT.
Compressing the load by hard seating the bullet will distort a soft cast bullet and accuracy suffers, so we use a separate compression die.
Bill is of the no resizing - finger seat school of thought. You can do that with a single shot rifle at the relatively low pressures of black powder.
I saw one guy bring out his charged cases with nothing but an overpowder wad, gently finger seating bullets as he set out his ammo for the next string of fire.
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