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I've converted a lot of 06 brass into 8mm Mauser and 7.7mm Jap. Never needed to ream, neck turn, or anneal. Never any problems. You're only changing things about 1/4".
You can do those things if you want, but if you don't need to, why bother??
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All else being equal (and it almost never is) bigger bullets tend to work better.
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