If you use some filler other than oats, you could use a cut down cartrige case (at your club there might be some one with a cartrige gun with some old or split cases you could have,) find the amount of filler you need then cut the case to size
With regards to flasks a friend uses a tube flask, he drilled holes in the base (filling) cap and covered the holes with duct tape so if some how an ember or spark did get in and ignite the powder, it would blow through the weakest point (the tape) and hopefully prevent the flask from becoming a hand granade
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