Re-15 was THE powder for the 14" .257 JDJ I used to have. And it was great in the Bullberry chamberings as well. But it seems to be history -- at least for now.
IMR-4350 will work, but if you have any H4895/IMR4895/AA2495, those should do very well in your carbine barrel. Ditto for Varget/SW Precision and even IMR and AA 4064.
I'm using SW Precision in the .270 JDJ, and the accuracy and consistency have been amazing. It is a great replacement for Varget except that now it seems to be gold-plated going by the current pricing.
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