Since you don't have one yet why not get a Mini-30 instead? The early -30s had a .308 bore instead of .311. It has a 1-10" twist so it should stabilise 180s. The gas bushing could be opened up so it will function at Whisper velocities. ASI makes an adjustable gas block for the Mini-14, don't know if they make a -30 version but I'll bet that they can if asked.
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