Here in the states we use Cream of Wheat, grits, or corn meal for filler. I like to use grits. I am not quite sure what semolina is i am guessing it is some kind of uncooked cereal. I have a brass frame 44 cal 51 Colt, 44 cal 58 Remingtion, and a Colt Walker. I load my Colt with 20 gr fff Goex and a 9mm case full of grits with a homemade 1/8 inch wad with a home cast .454 ball. I all so put a dab of Crisco the balls. In hot weather i use a 50/50 mix of Crisco and bees wax. I use the same load in my Remingtion except i use a 40 cal case full of grits. I have not tried filler in my Walker yet i have been having to much fun shooting 50 gr loads with it. Next time i take her out i will try filler powder goes real quick with 50gr loads.

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Mike