The main reason you rarely find data for extra light loads is simply because so few people are interested in it, and the people doing the load testing for the manuals, simply don't waste their time and money to research data that almost no one is interested in.
There have been detonations from reduced loads in certain calibers with certain powders, notably large capacity magnum cases and certain slow powders. They are quite rare, but some have happened. But the idea that ALL reduced loads are dangerous is bunk.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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