Originally Posted by
sharps4590
Ever since reading Grahame Wright's book, "Loading the British Double Rifle" I have been a user and proponent of open cell foam filler. Upon firing it disintegrates, basically into nothingness.
Sherman Bell in his pressure work on fillers found that cotton balls loosely packed gave the least pressure rise, dacron was next then open cell foam. Solid wads of any kind, cork, fiber, cardboard, doesn't matter, all gave the highest pressure rise and were strongly discouraged.
The foam is easily cut to any diameter with a cartridge case with the head cut off and mouth sharpened then inserted into a battery drill. Then it can be cut to the required length, if necessary.