I've just got a subsonic outfit together. I went with 300BLK because of the availability of factory subsonic rounds designed for hunting. Having said that, there is only one option, Hornady Sub-X. Same situation with .308, Winchester Super-X (confusing name!), but nowhere seemed to have these in stock. My setup is primarily for goats at less than 50 metres, so should be adequate. I would also consider 450BM or 45/70. If you reload, then there's no issues with .308. The other thing that I can add is that 300BLK subsonic has undetectable recoil.
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