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A 1/10" twist should stabilize bullets up to 220gr in a 30 cal rifle. Personally I`d not worry about stabilizing anything you plan on shooting from your barrel.
The same powders you use in any other 308 will work just as well in your shorter one. I`d stay with Varget, 4064, R15 etc. What ever is on hand.
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I must confess, I was born at a very early age. --Groucho Marx
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