If you take a careful look at almost any reloading manual, you'll find loads for some calibers that are just reprints from the previous version.
I can't single out Hodgdon- they all do it.
Case in point: a discontinued round like a 222 Remington Magnum, 284 Winchester, etc. Check the loading data in any manual, then check the previous version of the same manual. And the previous version. No new data, just the old stuff reprinted.
From the manual author's point of view, it's not worth all the work to try new powders and bullets for cartridges that don't get that much use any more.
If you happen to have one of those discontinued cartridges, and want to try a new powder, you're likely out of luck.
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