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at top margin

This is the right measure of the caliber, but the drill always rubs a bit more off.

Figure

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Mortar

They are better when shaped as the crucible with a narrow bottom and a larger mouth. You have to strongly crush the powder and add either some sand or some cork or even better a pure pierced wax plate because it seals well up and is more efficient. A bullet just makes a hole, the powder only is more efficient. One knows that they are stronger when kept in a dry place for fifteen days.

Figure at left bottom margin

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