Over powder card under a prb.

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A card wad will have absolutely no effect as a seal.

When the powder ignites, the pressure will force it to " cup " around the rear of the ball, with the edges having little or no contact with the barrel walls.

What it may do to improve accuracy is help scrape a little fowling from the previous shot loose from the bore on it's way down to be seated on the powder, with the patched ball wiping away more fowling as it is seated.
 

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