One important point that nobody has mentioned yet.
Each load manual that I have will list the gun used in testing the loads-
For example, on the page in my Lyman book where load data for 357Mag is given, up at the top of the page is info like, max case length, trim-to length, overall length, then comes something like "S&W 6 inch barrel" or something like "vented pressure test barrel"
Without taking the gun into consideration you end up comparing apples to pineapples.
If you buy one of those "Load Books" that give information from all sources for one specific cartrige, you will quickly see that if the identical gun is used by two publishers, the loads are nearly always the same too.
Jim
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Lay up some blackpowder and flints
The rest we can build, if need be
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