Cream of wheat has also been used ass a filler, but that is very dense & I would not recommend it. (They say it smells good too...)
COB, I have actually heard people comment that Trail Boss tends to result in fairly low pressures and velocity. In fact, sometimes a full case (compressed load) of that powder doesn't give the velocity that some people seek. These are all general statements, and of course, you must follow the manuals - but my point is that you may end up with a case that has an adequate volume of powder, and thus may not need a filler.
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