dawg, i'm like many of the previous posters: H4831SC is my standby in the .270, although I've gotten near as good a result from IMR 4350, both using the Nosler 130gr BT.
I can tell by your OP that buying a new powder for experimentation sake isn't your highest wish, but for reduced loads i've used A-5744; .270, .243, .30/06 and .308 all worked well with this powder. I did have to email Accurate for load data, but they were very quick with a reply.
I have IMR 4895 and 4064 on hand, but quite honestly it has never occurred to me to try them in the .270 since the slower powders worked so well.
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