Better to have to much twist than not enough. I would go with a 1:8 twist, as you will most likely end up reloading as you start to extend your range. If it were me, I would go 1:8 and load up Berger 105gr Hybrids at 3100 fps plus. That load would stay supersonic out to 1500 plus yards. That would be a deadly load for deer size game and smaller.
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