I wonder if they were worried about chain firing?
With a Superposed load it is a possibility.
(the balls)are made either ...by attaching a thin plate,...to a half ball by means of a very thin piece or by connecting two half-round balls by means of a very small piece in such a manner as to have a recess all round. This recess is filled with a composition consisting of three-fourths part of soap and one-quarter of oil.
By loading the chambers a sufficient charge of powder is put in, and then one of the balls, either with or without paper over the powder.
By ramming the ball down the recess of the ball will become compressed, and thereby the above-mentioned grease or composition will be forced out of the same, filling in every part between the ball and the barrel. By this arrangement the chamber will be well greased and the barrel by each discharge will be thereby well cleaned. By the forcible pressing out of the grease so as to fill every crevice between the ball and the chamber every danger is likewise prevented by which the after-charge might be ignited when the forward charge is fired off, and as this forms a perfect airtight packing for the ball the powder will have more force and be able to send the ball at greater distance.
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