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I too have an SBR barrel on the way. While I don't have any true experience yet, my research says the faster burning powers in 300 whisper should work best. That would be slower to faster: 296, Lil Gun and 2400. I stocked up on some Lil Gun and 296. I have some 2400 left over from 44 mag loads.
I'll let you know when my barrel shows up. I have a 9.5" coming.
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