I've always followed the shotshell recipes strictly. If the recipe called for a Winchester 209 primer, that's what I used. If the recipe called for a Federal plastic target hull, I used that.etc…..
Recently I witness a retailer pour water in a particular hull and then transfer that water to a different hull to test if the internal volume was sufficient to handle the same load. His assumption was that the only criteria for a particular hull was internal volume. If both hulls held (closely) the same volume, then it was OK to substitute that hull for the other.
My question....what substitutions are acceptable in reloading shot shells given that I (like almost everyone else) have no way of measuring pressure levels.
