I use 3f but can't tell you weight. Exact weight is not important. Volume is important. Specifically, you must NOT leave any air space between the powder and the bullet. Use enough powder by volume so that when the bullet is seated, you will compress the powder slightly.
You can't play with light vs heavy loads as you can with smokeless powder. You can reduce black powder loads, but if you are just starting to load with black powder, I would not reccommend it.
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