I read it again. I got it right. Post #15, right? You were pretty specific.
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As mentioned "most"& "most" is not all.
I fully realize and often explain to others, that rifles even with consecutive sn, can and likely are, 180° opposite in there likes and dislikes.
BUT, often you will see powders DIRECTLY associated with a given Cartritage.
Have you seen H380? Do you know how it acquired its name? Well its from its use with 22/250. "38" is the preferred charge.
How about IMR 4350 and the 30/06, or H4831 and the 270?
Maybe h4350 and the 6.5 Creed?
If you have been around and read just a little you have seen these powders recommended for these calibers.
Again, this is a open forum. You requested comments by your post or outright question. Your not lilely to receive answers you expect but all too often thats the irony cause occasionally your looking 180° in wrong direction and just needed a lil nudge to consider anothers opinion and experience.
CW