Greetings,
My picks would include AR2206H for its sheer flexibility. I use it more than any other powder including reduced loads in my old soldiers. AR2209 would work well in the Creedmoor and even the .270. The Grendel however would need a faster powder such as BM8208. You could just go with BM8208 and AR2209 but I would sorely miss AR2206H.
Regards Grandpamac.
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