I get pretty good results with hot glue bullets. Get a bullet mould and a hot glue gun and make some up, use a primer only and it is a good idea to open flas hole some. 25' accurate and will completely pass through a full can of pop. I've been tinkering with this on and off for years.
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Here are a few of my goofy plinkers-
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On the left is a 38 sp case cut down to seat the glue bullet directly on the flash hole, it makes it a little quieter but not really worth the extra effort. The one on the right is unmodified 38 sp case with the same glue bullet from a 158 swc lee mould.