in my roger & Spencer 44 i use 20 grains of fine black, then oats to fill the cylinder then ball, when pressed in the ball is a few will below mm the cylinder surface
semolina does not compress that much so its trial and error (your cylinder is a different size to the one in my R & S)
try these http://www.hsconline.co.uk/blue-plastic-box-with-50xS1 they hold about 35 grains i went with glass as plastic tends to go black with the dust from the powder
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